US Patent Class 400
TYPEWRITING MACHINES




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Current as of: June, 1999
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  DF  CLASS NOTES
1  DF  INCLUDING JUSTIFICATION OR QUADDING OF PRINT-LINE
2  DF  .~ Including quadding of print-line
3  DF  .~ By programmed-control-system
4  DF  .~.~ On auxiliary-record-program (e.g., tape, card, etc.)
5  DF  .~.~.~ Magnetic record
6  DF  .~.~.~ With error-correcting storage register
7  DF  .~.~.~ Including artificial or end-of-line hyphen
8  DF  .~ By using "no-print" device
9  DF  .~ By interword or intercharacter spacing
10  DF  .~.~ Variable carriage-feed mechanism
11  DF  .~.~ Carriage slidable relative to its carriage-rack
12  DF  .~.~ By interword spacing only
13  DF  .~.~.~ Including plural space-bars for different spacings
14  DF  .~ By typing line on stretchable medium
15  DF  .~ Including justification indicator
16  DF  FOR TYPING OR FORMING CONTINUOUS OR DISCONTINUOUS LINE (E.G., BY "LINER")
17  DF  .~ Including programmed-control-system
18  DF  .~ By scriber (e.g., pen, pencil, etc.) or with scriber guide
19  DF  .~.~ For writing in script
20  DF  .~.~ Rotatable disc scriber
21  DF  .~ Responsive to carriage movement
22  DF  .~ Underscoring concurrently with character imprinting
23  DF  FOR TYPING ON FLAT RECORD-MEDIUM OR AGAINST FLAT PLATEN
24  DF  .~ For typing on a book
25  DF  .~.~ Including a type-head (e.g., cylinder, disc, etc.)
26  DF  .~.~ Against cylindrical backing
27  DF  .~.~ Including adjustment of typewriter relative to book (e.g., to compensate for book thickness)
28  DF  .~.~ Including adjustment of book support relative to typewriter (e.g., for top or bottom of book, etc.)
29  DF  .~ For typing on flat blueprint or drawing (e.g., "platenless" typewriter)
30  DF  .~ For typing on carton or package
31  DF  .~ By multidirectional movement of typewriter structure (e.g., "Elliot-Fisher" structure)
32  DF  .~ Bottom-strike typewriter including type-bar action or bar platen or anvil platen
33  DF  .~ Top-strike typewriter including pivoted type-bar
34  DF  .~ Including carriage-return mechanism
35  DF  .~ Including case-shift by shifting platen
36  DF  .~ Including ribbon-feed mechanism
37  DF  .~ For typing on manifold set (e.g., with type-die, etc.)
38  DF  .~.~ Including feeding of wide carbon paper transverse to feed of record-medium
39  DF  .~.~ Including spool for roll of carbon paper
40  DF  .~.~ Including clamp or guide for carbon paper
41  DF  .~.~ Including adjustment of platen perpendicular to its surface
42  DF  .~.~ Including aligning and feeding manifold set
43  DF  .~ Including feed of tally strip
44  DF  .~ Including line-spacing mechanism
45  DF  .~.~ Platen shifted for line-spacing
46  DF  .~.~ Including adjustment of line-space distance or increment
47  DF  .~.~ Including disengagement of line-spacing mechanism
48  DF  .~ Work support (e.g, sheet or card holddown or guide, sheet-size platen, etc.)
49  DF  .~ Collating-table attachment
50  DF  INCLUDING DELAY MEANS FOR PREVENTING MALFUNCTION IN POWERED TYPEWRITER
51  DF  .~ Delay of sequential character rate in programmed-control typewriter
52  DF  .~ Delay by storage of next character to be imprinted
53  DF  INCLUDING ADJUSTMENT MEANS TO COMPENSATE FOR WEAR
54  DF  SAFETY SWITCH OR CONDITION-RESPONSIVE-CUTOFF SWITCH FOR ELECTRICALLY POWERED TYPEWRITER
55  DF  INCLUDING ADJUSTMENT FOR OPTIMUM PRINTING PLANE
56  DF  .~ Responsive to thickness of record-medium
57  DF  .~ In accordance with the number of sheets of record-medium
58  DF  .~ By adjustment of platen relative to carriage
59  DF  .~ By adjustment of carriage (e.g, carriage-guide rollers)
60  DF  .~.~ Via adjustment of case-shift linkage
61  DF  INCLUDING CONTROL OF FORMAT AND SELECTION OF TYPE-FACE BY PROGRAMMED CONTROL-SYSTEM (E.G., INPUT TYPEWRITER)
62  DF  .~ Including means for responding to input program or incoming signals and providing output program or signals representing typing operations (e.g., output typewriter)
63  DF  .~ Including editing or revision system
64  DF  .~ Including right-hand margin control system
65  DF  .~ Including typing of graphical representations
66  DF  .~ Including baseplate attachment with electromagnets for input or output operations
67  DF  .~ Separate interrelated programs
68  DF  .~.~ Including message writing (e.g, address program, form-letter program, etc.)
69  DF  .~ Type-face selection via magnetic program tape
70  DF  INCLUDING SELECTION OF TYPE-FACE BY PROGRAMMED-CONTROL-SYSTEM OR BY REMOTE CONTROL
71  DF  .~ Plural typewriters coupled for simultaneous operation (e.g., "master-slave" relationship)
72  DF  .~ Including character-selection latches (e.g., for type-face selection)
73  DF  .~ Including particular reader structure and operation
74  DF  .~ Including error detection
75  DF  .~ Including type-bar selection using mechanical program
76  DF  INCLUDING CONTROL OF FORMAT BY PROGRAMMED-CONTROL-SYSTEM
77  DF  TYPEWRITER CONTROLS OTHER INFORMATION RECORDER
78  DF  .~ Typewriter controls apparatus used for accounting function
79  DF  .~.~ And a tape-punch or card-punch apparatus
80  DF  .~ Typewriter (e.g, output typewriter) controls tape-punch or card-punch apparatus
81  DF  .~.~ And imprints the character represented by the punched code on the tape or card
82  DF  INCLUDING PLURAL, INDEPENDENTLY SUPPORTED KEY-BOARDS, PLATENS, OR TYPE-SET ASSEMBLAGES
83  DF  DISPLAYING TYPEWRITER-FORMED REPRESENTATION OF PRINT-LINE
84  DF  .~ By projecting typed image on screen
85  DF  .~.~ Including transparent or transluscent record-medium
86  DF  OPERATING BY SOUND
87  DF  FOR OPERATION BY HANDICAPPED USER
88  DF  POCKET TYPEWRITER
89  DF  KEY REASSIGNMENT
90  DF  .~ Electrically powered
91  DF  STENOGRAPHIC TYPEWRITER
92  DF  .~ Using common-letter type-face
93  DF  .~.~ Including plural type-faces mounted on carrier and movable for selection of type-face
94  DF  .~ Electrically powered
95  DF  LOGOTYPE TYPEWRITER (E.G., WORD TYPING)
96  DF  .~ Including date-stamp type-face
97  DF  .~ Including signature type-face
98  DF  .~ Actuation of single key types plural characters
99  DF  .~.~ Characters typed simultaneously
100  DF  PLURAL-KEY-ACTUATED TYPEWRITER (E.G., PERMUTATIVE KEY-BOARD)
101  DF  .~ Having type-faces disposed on pivotable type-bars
102  DF  .~ Having type-faces disposed on rotatable type-head
103  DF  CODE-PRINTING TYPEWRITER (E.G., FOR PRINTING A PATTERN OR MARK)
104  DF  .~ For typing and encoding
105  DF  .~.~ Including magnetic encoding
106  DF  .~ Including coded ink (e.g., phosphorescent or color-coded ink, etc.)
107  DF  .~ For coding by conductive mark
108  DF  .~ For marking laundry
109  DF  FOREIGN LANGUAGE OR BRAILLE TYPEWRITER
109.1  DF  .~ Braille
110  DF  .~ Including Oriental lanugage
111  DF  .~ Including Semitic language
112  DF  ANNULAR TYPEWRITER (E.G., FOR TYPING AROUND CIRCUMFERENCE OF PLATEN)
113  DF  .~ Including vertically disposed platen
114  DF  .~ Platen axis horizontal and extending front-to-rear
115  DF  .~ Powered Actuated
116  DF  MUSIC-ROLL OR MUSICAL-NOTATION TYPEWRITER
117  DF  .~ Musical-notation typewriter
118.1  DF  TYPING BY HEATED DIE
118.2  DF  TYPING BY OTHER THAN TYPE-FACE OR TYPE-DIE
118.3  DF  .~ Electroconductive transfer
120.01  DF  .~ Thermal
120.02  DF  .~.~ Multicolor
120.03  DF  .~.~.~ Having multilayered colored transfer material
120.04  DF  .~.~.~ Having single layer colored transfer material
120.05  DF  .~.~ Block driving
120.06  DF  .~.~.~ Sequentially
120.07  DF  .~.~ Gradational recording
120.08  DF  .~.~ Preheating
120.09  DF  .~.~ Density control
120.1  DF  .~.~.~ By number of heated recording elements
120.11  DF  .~.~.~ In accordance with output characteristic of recording elements
120.12  DF  .~.~.~ By voltage regulation
120.13  DF  .~.~.~ By transfer material or record receiver
120.14  DF  .~.~.~ In accordance with temperature of the recording means
120.15  DF  .~.~.~ By history of recording elements
120.16  DF  .~.~ Recording means support or actuator
120.17  DF  .~.~.~ Adjustable
120.18  DF  .~.~ Pre- or post-image recording treatment
124.01  DF  .~ Character formation by impact (e.g., wire matrix)
124.02  DF  .~.~ With signal conditioning
124.03  DF  .~.~.~ Overheat protection
124.04  DF  .~.~.~ Responsive to impact member position
124.05  DF  .~.~.~ Control of drive force
124.06  DF  .~.~.~.~ Manifold form or plural copies
124.07  DF  .~.~.~ With wear or defect compensation
124.08  DF  .~.~ Plural printheads
124.09  DF  .~.~.~ Multicolor
124.1  DF  .~.~ With inking
124.11  DF  .~.~ Printhead
124.12  DF  .~.~.~ Having assembly means
124.13  DF  .~.~.~ Overheat protection
124.14  DF  .~.~.~ With actuator
124.15  DF  .~.~.~.~ Single actuator for simultaneous actuation of plural impact members
124.16  DF  .~.~.~.~ Electrostrictive, magnetostrictive, or piezoelectric
124.17  DF  .~.~.~.~ Actuator having electromagnet
124.18  DF  .~.~.~.~.~ Electrical component
124.19  DF  .~.~.~.~.~.~ Moving coil
124.2  DF  .~.~.~.~.~.~ Permanent magnet
124.21  DF  .~.~.~.~.~ With biasing means
124.22  DF  .~.~.~.~.~.~ Backstop
124.23  DF  .~.~.~.~.~ Armature structure or mounting
124.24  DF  .~.~.~ Impact member guide
124.25  DF  .~.~.~.~ With lubricator
124.26  DF  .~.~.~.~ Specific material
124.27  DF  .~.~.~.~ Including shifting of guide
124.28  DF  .~.~.~ Impact member tip arrangement
124.29  DF  .~.~.~ Impact member structure
124.3  DF  .~.~.~.~ Tip cross-section
124.31  DF  .~.~.~.~ With attachment or engagement means
124.32  DF  .~.~.~.~ Specific material
127  DF  TYPING TO PRODUCE EMBOSSED CHARACTER
128  DF  .~ Character embossed or typed on nonplanar article (e.g., golf ball, toothbrush, etc.)
129  DF  .~ By type-die mounted on carrier movable for selection of character
130  DF  .~.~ Including programmed-control-system
131  DF  .~.~ Electrically powered
132  DF  .~.~ Type-die reciprocable on carrier
133  DF  .~.~ On endless-band carrier
134  DF  .~.~ On rotatable carrier
134.1  DF  .~.~.~ Actuated by key-board control
134.2  DF  .~.~.~.~ Including type-die movable relative to carrier
134.3  DF  .~.~.~.~.~ With magazine for supply of record-medium plates
134.4  DF  .~.~.~ On manually held embosser
134.5  DF  .~.~.~.~ Including web supply of record-medium
134.6  DF  .~.~.~ Including web supply of record-medium
135  DF  TYPING TO PRODUCE PIERCED CHARACTER
136  DF  .~ Cutout character for stencil
137  DF  .~ Check-protection character
138  DF  .~.~ By type-die mounted on carrier movable for selection of character
138.1  DF  .~.~.~ Electrically powered
138.2  DF  .~.~.~ On rotatable carrier (e.g., for scarifying elements, etc.)
138.3  DF  .~.~.~.~ Actuated by key-board control
138.4  DF  .~.~.~.~ Including plural-character type-die
138.5  DF  .~.~.~.~.~ And rotating contact with platen
138.6  DF  .~.~.~.~ For type-die including piercing or cutting elements
139  DF  INCLUDING TYPE-SET-ASSEMBLAGE MOUNTED ON CARRIER AND RELATIVELY MOVABLE FOR SELECTION AND FOR IMPACT OF TYPE-FACE
140  DF  .~ Including type-faces movable relative to type-face-carrier
141  DF  .~.~ Slidable type-faces mounted on reciprocable carrier
141.1  DF  .~.~.~ On rotatable or oscillatable carrier reciprocable along its axis
142  DF  .~.~ Slidable type-faces on rotatable carrier
143  DF  .~.~ Rotatable type-face carrier including type-faces on pivotable arms
144  DF  .~.~ Type-face-carrier including type-faces on flexible arms
144.1  DF  .~.~.~ Rotatable or oscillatable carrier
144.2  DF  .~.~.~.~ Carrier having coplanar flexible arms (e.g., "daisy" wheel, etc.)
144.3  DF  .~.~.~.~.~ Continuously rotated carrier
144.4  DF  .~.~.~.~.~ Manually rotated carrier
145  DF  .~.~ Type-faces on deformable type-face-carrier
145.1  DF  .~.~.~ Rotatable carrier
145.2  DF  .~.~.~.~ Cylindrical carrier
146  DF  .~ Including endless-band carrier for type-faces
147  DF  .~ Type-faces arranged in rectilinear row and selected by reciprocable movement
148  DF  .~.~ On rotatable carrier having plural rectilinear rows
149  DF  .~ Plural type-heads mounted for selective individual type-head-imprinting movement
150  DF  .~.~ Type-heads arranged for selective individual imprinting movement away from coaxial rest position
151  DF  .~.~ Turret carrier for type-heads
151.1  DF  .~.~.~ Axis of turret carrier parallel to platen axis
152  DF  .~ Type drum having multiple type-set-assemblages
153  DF  .~ Imprint by movement of record-medium against type-face
154  DF  .~.~ By hammer impacting record-medium against type-face on type-head (e.g., type shuttle, etc.)
154.1  DF  .~.~.~ Including selection of type-face
154.2  DF  .~.~.~.~ Via pulley and cord arrangement (e.g., summing displacements)
154.3  DF  .~.~.~.~ By shortest peripheral path
154.4  DF  .~.~.~.~ Via coded disc in electric or magnetic circuit (e.g, photoelectric)
154.5  DF  .~.~.~.~ Via stepping motor responsive to selection
155  DF  .~.~.~.~ Via electrical or electromagnetic means
155.1  DF  .~.~.~.~.~ Including plural-function actuation by electromagnet(s)
156  DF  .~.~.~.~ Via helical arrangement of projections
156.1  DF  .~.~.~.~ Via mechanically permutated bar(s), disc(s), or plate(s)
156.2  DF  .~.~.~.~ Via planetary gear arrangement
156.3  DF  .~.~.~.~.~ Including latch means
157  DF  .~.~.~ Including type-faces arranged along helical path(s)
157.1  DF  .~.~.~ Including particular structure of hammer(s)
157.2  DF  .~.~.~.~ Electromagnetically actuated
157.3  DF  .~.~.~.~ For variable impression (e.g., impact control)
157.4  DF  .~.~.~.~ Hammer(s) mounted on endless belt or in helical array
158  DF  .~.~ Including platen for moving record-medium against type-face and mechanism for feeding record-medium
158.1  DF  .~.~.~ Including moving and feeding by platen
159  DF  .~.~ Including platen for moving record-medium against type-face and mechanism for inking type-face
160  DF  .~ Imprint by pivoting of type-head-carrier and type-head against record-medium
161  DF  .~.~ Type-head-carrier movable on movable carriage
161.1  DF  .~.~.~ Including selection of type-face (e.g., on "golf ball" type-head)
161.2  DF  .~.~.~.~ Via gear train
161.3  DF  .~.~.~.~.~ Gears mounted on type-head and type-head-carrier
161.4  DF  .~.~.~.~.~ Including gear (e.g., rack) reciprocated by transmission mechanism
161.5  DF  .~.~.~.~ Via multiple cam surfaces
162  DF  .~.~ Type-head movable for selection of type-face
162.1  DF  .~.~.~ Via pulley and cord arrangement
162.2  DF  .~.~.~ Via shortest peripheral path
162.3  DF  .~.~.~ Via coded disc in electric or magnetic circuit (e.g., photoelectric)
163  DF  .~.~.~ Via stepping motor responsive to selection
163.1  DF  .~.~.~ Via electrical or electromagnetic means
163.2  DF  .~.~.~.~ Including electromagnetically actuated type-head movement toward record-medium
163.3  DF  .~.~.~.~ Including plural-function actuation by electromagnet(s)
164  DF  .~.~.~ Via helical arrangement of projections
164.1  DF  .~.~.~ Via pneumatic actuation
164.2  DF  .~.~.~ Via setting elements actuating selector-command member(s)
164.3  DF  .~.~.~ Control arm connected to selection gear and movable to engage key-lever actuated abutment
164.4  DF  .~.~.~ Via stop pins actuatable by key-board
164.5  DF  .~.~.~ Toothed member connected to selection gear and slidable by key-lever movement
164.6  DF  .~.~.~ Selection gear rotated by key-lever movement
165  DF  .~.~.~ Simultaneous rotation and translation of type-head by manually powered actuation (e.g., helical shift)
165.1  DF  .~.~.~ Via manually powered actuation other than by key-board (e.g, stylus selection)
165.2  DF  .~.~.~.~ Including type-head movable to print-point by actuator common to all type faces
165.3  DF  .~.~.~.~.~ Selection by rotatable dial
166  DF  .~.~ Including impact control
167  DF  .~.~ Including rebound control
168  DF  .~.~ Articulated-support joint
169  DF  .~.~ Detenting to fix type-head for imprinting
170  DF  .~.~ Including movable printing anvil within type-head
171  DF  .~ Plural type-set-assemblages selectively movable from a storage station to a printing station
172  DF  .~ Type-faces mounted on type chips and removable from storage for printing
173  DF  .~ With means for exposing last-typed character
174  DF  .~ Type-head, per se
175  DF  .~.~ Detachable from carrier (e.g., interchangeable)
176  DF  HAVING FLUID-PRESSURE POWER DRIVE
177  DF  .~ Including pneumatic decoder for perforated tape
178  DF  .~ For producing typewriter-control tape (e.g., perforated tape, etc.)
179  DF  .~ For type-face selection or choice
180  DF  .~.~ Including key-board driven by external pneumatic source
181  DF  .~.~ By pneumatic actuation of type-face or type-bar
182  DF  .~ For movement of carriage or platen
183  DF  .~.~ Including line-spacing
184  DF  HAVING TYPEWRITER-CONTROLLED RECIPROCABLE ELECTROMAGNETIC DRIVE FOR PLURAL FUNCTIONS IN SAME TYPEWRITER
185  DF  HAVING POWER-DRIVEN OPERATOR FOR PLURAL FUNCTIONS
186  DF  .~ Via continuously rotated power roll selectively connected to operate
187  DF  .~ Usable selectively (e.g., for powered or manual operation, alternative usable functions, etc.)
188  DF  FOR TYPING ON REVERSE SURFACE OF RECORD-MEDIUM
189  DF  .~ By simultaneous use of both surfaces of same ribbon
190  DF  .~ By use of "carbon paper"
191  DF  INCLUDING INTERPOSED INKING DEVICE (E.G., RIBBON) FOR RECORD-MEDIUM
192  DF  .~ Moved by continuously rotating power drive intermittently applied
193  DF  .~ Inking device handheld during typing
194  DF  .~ Endless ribbon or cartridge therefor
195  DF  .~.~ Mobius strip
196  DF  .~.~ Including storage (e.g., in cartridge, etc.) of ribbon
196.1  DF  .~.~.~ Having ribbon stored in pleated form
197  DF  .~ Renovation of used ribbon
198  DF  .~.~ With ink heater (e.g., for melting solid ink)
199  DF  .~.~ By discrete auxiliary band movable with ribbon
200  DF  .~.~ Selectively actuatable re-inker
201  DF  .~.~ Of multicolor ribbon
202  DF  .~.~ Renovator attachable to typewriter for replenishing ribbon ink
202.1  DF  .~.~.~ Attached to ribbon spool
202.2  DF  .~.~.~ And includes refillable chamber (e.g., reservoir) for liquid ink
202.3  DF  .~.~.~.~ And conveyor of discrete drops of ink
202.4  DF  .~.~.~.~ And re-inking roller
203  DF  .~ Ribbon disposed within platen
204  DF  .~ For typing plural copies simultaneously with ribbon(s) (e.g., duplicate typing)
205  DF  .~.~ Including holder for short length of ribbon
205.1  DF  .~.~.~ Holder movable to inoperative position on typewriter
206  DF  .~.~ Using plural ribbons (e.g., additional ribbon(s)
206.1  DF  .~.~.~ Including "carbon paper" ribbon
206.2  DF  .~.~.~ And ribbon holder movable to inoperative position on typewriter
206.3  DF  .~.~.~ On plural coaxial spools
206.4  DF  .~.~.~ On single spool
207  DF  .~ Package for ribbon facilitating mounting of ribbon on typewriter (e.g., ribbon cartridge)
208  DF  .~.~ Package attached to typewriter
208.1  DF  .~.~.~ And includes separable assemblage of spools
209  DF  .~ For bottom-strike typewriter
210  DF  .~ For boldface typing
211  DF  .~ Including mechanism for shifting ribbon laterally at print-point
212  DF  .~.~ Via electrically powered actuator
213  DF  .~.~ For impact of successive type-faces on one field of ribbon in path not parallel to longitudinal extent of ribbon (e.g., "zigzag", oblique, etc.)
213.1  DF  .~.~.~ Via ribbon vibrator
214  DF  .~.~ Plural ribbons shiftable laterally (e.g., by duplicate vibrators)
215  DF  .~.~ By ribbon vibrator
215.1  DF  .~.~.~ Including vibrator shiftable during use of nonfeed character key (e.g., for typing accent mark, etc.)
215.2  DF  .~.~.~ With retardation of vibrator return after type-face impact (e.g., with dashpot)
215.3  DF  .~.~.~ With elevation and holding of vibrator above print-point (e.g., to facilitate ribbon insertion)
215.4  DF  .~.~.~ With inactivation of vibrator (e.g., for cutting a stencil)
216  DF  .~.~.~ Including variable throw of vibrator
216.1  DF  .~.~.~.~ For diverse-field (e.g., plural-color) ribbon
216.2  DF  .~.~.~.~.~ With typewriter-controlled change of field
216.3  DF  .~.~.~.~.~ By movement parallel to print-line
216.4  DF  .~.~.~.~.~ Vibrator throw controlled via alternate pins selectively inserted in slots
216.5  DF  .~.~.~.~.~ Field selection by selectively positioned stop faces to limit vibrator movement
216.6  DF  .~.~.~.~.~ To compensate for case-shift
217  DF  .~.~ To shift impact path (e.g., during ribbon reversal)
217.1  DF  .~.~.~ By adjustable ribbon guide spaced from supply spool
218  DF  .~ Ribbon-reversing mechanism
219  DF  .~.~ Including means responsive to depletion of ribbon supply
219.1  DF  .~.~.~ Including an electric switch
219.2  DF  .~.~.~ Including lever retained in spool by wound ribbon
219.3  DF  .~.~.~ Including senser for diameter of wound ribbon
219.4  DF  .~.~.~.~ Senser received in depression in core of spool
219.5  DF  .~.~.~ Including projection from ribbon
220  DF  .~.~ Alternative pawl-and-ratchet drive including ratchet directly connected to spool or spindle
220.1  DF  .~.~.~ Including a common pawl member (e.g.. double-toothed pawl)
220.2  DF  .~.~.~ Including member interposed in pawl drive path
221  DF  .~.~ Alternative gear drive including gear directly connected to spool or spindle
221.1  DF  .~.~.~ And gears mounted on ends of axially shiftable common shaft
221.2  DF  .~.~.~ And gears mounted on ends of pivoted common shaft
222  DF  .~.~ Alternative clutch drive including clutch member directly connected to spool or spindle
223  DF  .~ Ribbon-feeding mechanism
224  DF  .~.~ For feeding ribbon angularly to print-line at print-point
224.1  DF  .~.~.~ Ribbon fed perpendicular to print-line at print-point
224.2  DF  .~.~.~.~ Ribbon is full-page wide
225  DF  .~.~ Including electrically powered drive means (e.g., solenoid, stepping motor, etc.)
226  DF  .~.~ For feeding ribbon partial character-space before impact and partial character-space after impact
227  DF  .~.~ For narrow carbon ribbon (e.g., carbon ink, "single use", etc.)
227.1  DF  .~.~.~ Ribbon destroyed after use
227.2  DF  .~.~.~ Or for alternatively used fabric ribbon
228  DF  .~.~ Including pin-feed-engaging ribbon
229  DF  .~.~ Mounted with movable type-face-carrier or type-head-carrier
230  DF  .~.~ With fast rewind of ribbon
231  DF  .~.~ With prevention of ribbon feed (e.g., for nontype operation, etc.)
232  DF  .~.~ Including feed at particular feed rate (e.g., "creep" feed)
233  DF  .~.~ Ribbon feed from supply only during carriage return
234  DF  .~.~ Including ribbon tensioner
235  DF  .~.~ Drive applied by means directly engaging ribbon in advance of takeup
235.1  DF  .~.~.~ Drive applied by pinch-roller couple
236  DF  .~.~ Drive applied directly to spool or spool spindle
236.1  DF  .~.~.~ By a pawl driving a ratchet on the spool or spindle
236.2  DF  .~.~.~ By a gear driving a gear on the spool or spindle
237  DF  .~ Ribbon, per se
238  DF  .~.~ Having leader portion (e.g., for threading, etc.)
239  DF  .~.~ With ribbon-reversing indicator or device on ribbon
240  DF  .~.~ Including differently pigmented fields
240.1  DF  .~.~.~ Including correction-material field
240.2  DF  .~.~.~ With prevention of bleeding between adjacent fields
240.3  DF  .~.~.~ Including fields arranged transversely to elongated dimension of ribbon
240.4  DF  .~.~.~ Including more than two fields
241  DF  .~.~ Particular ribbon material
241.1  DF  .~.~.~ Synthetic material
241.2  DF  .~.~.~.~ Wherein ink is entrapped in ribbon material (e.g., microcapsules, micropores, etc.)
241.3  DF  .~.~.~ Particular weave pattern
241.4  DF  .~.~.~ Including ink-impervious backing for ribbon
242  DF  .~ Ribbon spool or mount therefor
243  DF  .~.~ Universally adaptable
244  DF  .~.~ Including ribbon-reversing indicator or device on spool or mount
245  DF  .~.~ Including magnetic retainer
246  DF  .~.~ Spool for full-page-wide ribbon
247  DF  .~ Means auxiliary to ribbon mechanism (e.g., shield, guide, etc.)
248  DF  .~.~ Including guide for ribbon
248.1  DF  .~.~.~ Ribbon guide opening expandable to facilitate ribbon insertion
248.2  DF  .~.~.~.~ And typewriter-actuated closing of guide
248.3  DF  .~.~.~ Including electrical, magnetic, or pneumatic guide means
249  DF  .~.~ Including indicator for depletion of ribbon (e.g., bell, sign, etc.)
250  DF  .~.~ Including tool for inserting ribbon
251  DF  CASE-SHIFT MECHANISM
252  DF  .~ Including programmed-control-system
253  DF  .~ Including electronic control or code-bar control
254  DF  .~ Controlled by typewriter-actuated mechanism
255  DF  .~ Including plural case-shift mechanisms (e.g., for simultaneous or selective use)
256  DF  .~ Actuated by toggle-linkage
257  DF  .~ For case-shift by type-head (e.g., spherical type-head) movement
258  DF  .~ Power-operated mechanism (e.g., for locking shift key)
259  DF  .~.~ For shifting platen
260  DF  .~.~ For shifting type-bar-segment
261  DF  .~ Multiple-shift mechanism (i.e., for type-bar having three or more type faces thereon)
262  DF  .~.~ For shifting type-bar-segment
263  DF  .~.~ For shifting type-bar or type-face on type-bar
263.1  DF  .~.~.~ By pivoting type-face relative to type-bar
263.2  DF  .~.~.~ By rotating type-face relative to type-bar
264  DF  .~ For shifting platen
265  DF  .~.~ Fore-and-aft (e.g., for top-strike or bottom-strike typewriter)
266  DF  .~.~ Mounted on pivotally movable platen carrier
266.1  DF  .~.~.~ With movement of platen out of typing position
266.2  DF  .~.~.~ Including adjustable counterbalance spring
266.3  DF  .~.~.~ Including a yieldable link (e.g., spring, etc.)
267  DF  .~.~ By depression of space-bar
268  DF  .~ For shifting type-face or type-bar
269  DF  .~.~ By shifting type-bar or type-face on type-bar
269.1  DF  .~.~.~ By pivoting type-face relative to type-bar
270  DF  .~.~ Mounted on type-bar support (e.g., guide pin, type-bar-segment, etc.)
270.1  DF  .~.~.~ Ring hanger support
270.2  DF  .~.~.~ Including ball-bearing support
270.3  DF  .~.~.~ Including pivoted-lever support (e.g., cantilever spring, etc.)
271  DF  .~ By choosing from one of a plurality of type-bars operated by a single key
272  DF  .~ Including key attachment for case-shift
273  DF  .~.~ Operated by user's leg, (e.g., foot, knee, etc.)
274  DF  .~ For locking case-shift mechanism in position (e.g., rebound lock, cam, etc.)
275  DF  .~.~ For locking platen in fore-and-aft position (e.g., by overcenter spring, etc.)
276  DF  .~.~ For locking shift-key lever in depressed position
276.1  DF  .~.~.~ By toggle-linkage
276.2  DF  .~.~.~ By means pivoted on shift-key lever
277  DF  .~ Including limit stop (e.g., block, chain, etc.)
278  DF  .~.~ Including limit screw
279  DF  CONTROL OF PRINT POSITION ALONG PRINT-LINE BY SIGNAL GENERATED BY PROGRAMMED-CONTROL-SYSTEM
280  DF  .~ Program is indicia on auxiliary member
281  DF  .~.~ Member is punched tape or card
282  DF  .~ Program is indicia on record-medium
283  DF  CARRIAGE OR CARRIAGE-MOVING OR MOVEMENT-REGULATING MECHANISM
284  DF  .~ For stopping carriage in tabular position (e.g., column-set positions)
285  DF  .~.~ In denominational positions
285.1  DF  .~.~.~ And column-set positions
285.2  DF  .~.~.~.~ Tab-rack stop intercepted by denominational-stop
285.3  DF  .~.~.~.~.~ Tab stops grouped in stepped fashion
285.4  DF  .~.~.~ With control of zero or space for decimal point
285.5  DF  .~.~.~ With reverse-direction movement of carriage
285.6  DF  .~.~.~ Helically mounted denominational-stop(s)
286  DF  .~.~.~ Shiftable denominational-stop(s)
286.1  DF  .~.~.~.~ Step-shaped denominational- or tab-stop(s)
286.2  DF  .~.~.~.~ Engaging movable tab-rack means
286.3  DF  .~.~.~ With latch or lock means
287  DF  .~.~ Column set by control of mutilated carriage-rack
288  DF  .~.~ Column set by control of tab-rack
289  DF  .~.~ Column set by control of tap-stops or column-stops or counter-stops
289.1  DF  .~.~.~ Tab-stops grouped in stepped fashion
290  DF  .~.~ Forward or reverse tabulation
291  DF  .~.~ With impact cushion or rebound check
292  DF  .~.~ With control of carriage velocity
293  DF  .~.~ By multiple-pitch tab-racks or multilated gear
294  DF  .~.~ Stop-setting or stop-clearing mechanism
294.1  DF  .~.~.~ With stop magazine (i.e., for supply of stops)
294.2  DF  .~.~.~ With key-locking mechanism
294.3  DF  .~.~.~ Drum-mounted tab-stops
295  DF  .~.~.~ Stop setting by linear shift of tab-stop or counter-stop
295.1  DF  .~.~.~.~ Stop shifts horizontally from tab-rack
295.2  DF  .~.~.~.~ Stop shifts laterally along tab-rack
296  DF  .~.~.~ Stop setting by movement of tab-rack
296.1  DF  .~.~.~.~ Tab-rack rotates about its axis
296.2  DF  .~.~.~.~ Plural tab-racks
297  DF  .~.~.~ Stop setting by partial rotation of tab stop relative to tab-rack
297.1  DF  .~.~.~ Stop setting by pivoting pawllike stop
298  DF  .~.~ Tab-stop or tab-rack structure, per se
299  DF  .~ With rotatable type wheel for repeat printing in response to carriage movement
300  DF  .~ Key-actuated mechanism for nonfeed of carriage (e.g., "silent" key, locking carriage, etc.)
301  DF  .~.~ By disabling carriage-escapement mechanism
302  DF  .~.~ By key actuated independently of carriage feed
303  DF  .~ For varying carriage feed
304  DF  .~.~ For kerning or overlap imprinting
305  DF  .~.~ By force-feed or screw-feed mechanism
306  DF  .~.~ Proportional to variable widths of imprinted characters
306.1  DF  .~.~.~ By settable elements (e.g., pins, bars, slides)
306.2  DF  .~.~.~ By ratchet-wheel and controlled pawl
306.3  DF  .~.~.~.~ Including multiple pawls
306.4  DF  .~.~.~.~.~ And multiple wheels
307  DF  .~.~.~ By ratchet rack and controlled pawl
307.1  DF  .~.~.~.~ Including multiple pawls
307.2  DF  .~.~.~ By cooperating toothed members (e.g., gear, segment, rack, etc.)
308  DF  .~ Carriage backspace mechanism
309  DF  .~.~ Backspace proportional to variable width of imprinted characters
310  DF  .~.~ Including powered drive means
311  DF  .~.~ Including pawl and escapement wheel
312  DF  .~.~ Including pawl and escapement rack
313  DF  .~ Carriage-return mechanism
314  DF  .~.~ With concurrent line-spacing
314.1  DF  .~.~.~ Using electromagnetic drive
314.2  DF  .~.~.~ For selected number of line-spaces
314.3  DF  .~.~.~ With disconnection of return by margin-stop
314.4  DF  .~.~.~ Initiated by user's leg or foot
314.5  DF  .~.~.~ Initiated by actuator adjacent key-board
314.6  DF  .~.~.~ By return-clutch means
315  DF  .~.~ Responsive to carriage position
316  DF  .~.~ Partial return (e.g., for start of paragraph, etc.)
317  DF  .~.~ Including power drive (e.g., electric, spring, etc.)
317.1  DF  .~.~.~ For bidirectional drive
317.2  DF  .~.~.~ By spring-driven motor
317.3  DF  .~.~.~ Powered via engagement of a clutch
318  DF  .~.~ Initiated by actuator adjacent key-board
319  DF  .~ Carriage-feed mechanism (e.g., escapement, etc.)
320  DF  .~.~ For carriage on which a type-head-carrier is mounted
320.1  DF  .~.~.~ With concurrent movement of carriage for record-medium and carriage for type-head-carrier
321  DF  .~.~ With repeat spacing
322  DF  .~.~ By electric or magnetic power
323  DF  .~.~ Carriage-feed in two directions (e.g., continuous typing in both directions)
323.1  DF  .~.~.~ In selected direction (e.g., for Semitic language, etc.)
324  DF  .~.~ Word-space concurrent with typing of last character of word
325  DF  .~.~ By space-bar mechanism (e.g., separate connection to escapement) or paragraph-indentation key
326  DF  .~.~ With compensator for tilt of typewriter
327  DF  .~.~ For diagonal print-line
328  DF  .~.~ By force-feed or screw mechanism (e.g., direct drive, screw-biasing carriage, etc.)
328.1  DF  .~.~.~ Including pawl and toothed rack
329  DF  .~.~ Carriage escapement controlled by pawl
329.1  DF  .~.~.~ Means to ensure engagement of pawl at start of print-line (i.e., overbanking control)
329.2  DF  .~.~.~ Carriage-feed initiated and completed during depression of character key (e.g., "speed" or "reverse" escapement)
329.3  DF  .~.~.~ Pawl rocker spring regulating device
330  DF  .~.~.~ Via ratchet wheel connected to pinion and carriage-rack
330.1  DF  .~.~.~.~ And plural pawls
330.2  DF  .~.~.~.~.~ For half-drop escapement
330.3  DF  .~.~.~.~.~ Mounted on pivotable pawl carrier or rocker
330.4  DF  .~.~.~.~.~.~ Including pawl(s) fixed to rocker
330.5  DF  .~.~.~.~.~.~.~ And slidable pawl
330.6  DF  .~.~.~.~.~.~.~ Including pawl pivoted about axis parallel to rocker axis
330.7  DF  .~.~.~.~.~ Mounted on movable (e.g., rotatable, slidable) pawl carrier
330.8  DF  .~.~.~.~.~ Including particular structure of pawl (e.g., pivoted, unitary, with roller, etc.)
331  DF  .~.~.~.~ Including plural ratchet wheels
331.1  DF  .~.~.~.~ Including particular structure of ratchet wheel
331.2  DF  .~.~.~.~ Including cushioned escapement support (e.g., rocker, pawl buffer, etc.)
331.3  DF  .~.~.~.~ Including particular structure of mount for ratchet wheel (e.g., bearing, clutch, etc.)
332  DF  .~.~.~ Via toothed rack
332.1  DF  .~.~.~.~ And plural pawls
332.2  DF  .~.~.~.~.~ Mounted on pivotable pawl carrier or rocker
332.3  DF  .~.~.~.~.~ Mounted on movable (e.g., rotatable, slidable) pawl carrier
332.4  DF  .~.~.~.~.~ Including particular structure of pawl (e.g., slidable, pivoted, unitary, etc.)
332.5  DF  .~.~.~.~ Including plural toothed racks (e.g., pivoted, etc.)
332.6  DF  .~.~.~.~ Including particular structure of rack (e.g., toothed, slidable, etc.)
333  DF  .~.~ Universal-bar or actuator therefor
333.1  DF  .~.~.~ Connected to actuator for another function
333.2  DF  .~.~.~ Adjustable
333.3  DF  .~.~.~ Actuated by type-bar or type-bar action
334  DF  .~.~ Carriage-feed-release mechanism
334.1  DF  .~.~.~ By disengagement of clutch between ratchet wheel and pinion
334.2  DF  .~.~.~ By disengagement of escapement pawl(s)
334.3  DF  .~.~.~.~ From carriage-rack
335  DF  .~.~ With particular connection to carriage (e.g., gear train, pulley and strap, etc.)
336  DF  .~.~ Spring-biasing carriage for feed
336.1  DF  .~.~.~ Torsion spring in rotatable barrel
337  DF  .~ Carriage-retarder mechanism
338  DF  .~.~ Including governor responsive to speed or momentum
338.1  DF  .~.~.~ Using centrifugal force
338.2  DF  .~.~.~ Using inertial force retarder (e.g., flywheel, weight, etc.)
339  DF  .~.~ Using fluid or fluent-material retarder
340  DF  .~.~ Using frictional retarder (e.g., strap, disc, drum, etc.)
341  DF  .~.~ Carriage-buffer stop or rebound control
342  DF  .~ Margin-regulator (e.g., adjustable margin-stop) mechanism
343  DF  .~.~ With intermediate margin-stop
344  DF  .~.~ With other typewriter function controlled by margin-stop (e.g., signal, line-space)
345  DF  .~.~.~ Carriage-arrest function (e.g., "overbank")
346  DF  .~.~.~ Print-line locking function
347  DF  .~.~ With multiple-pitch selector
348  DF  .~.~ With release of margin-stop
349  DF  .~.~ Conjointly set or centrally spring biased
350  DF  .~.~ On record-medium table or paper-finger
351  DF  .~.~ Margin-stop structure, per se
352  DF  .~ Carriage, per se, or guideway therefor
353  DF  .~.~ Including auxiliary carriage
354  DF  .~.~ Guideway or bearings for carriage
354.1  DF  .~.~.~ Guideway cooperating with ball bearings or roller bearings
354.2  DF  .~.~.~.~ Including bearing holder geared to carriage
354.3  DF  .~.~.~.~ Including respositionable guideway
355  DF  .~ Means for repositioning carriage or platen thereon
356  DF  .~.~ To nonprint position
357  DF  .~.~ To detach carriage
358  DF  .~.~ To detach platen
359  DF  HAVING TYPEWRITER-CONTROLLED RECIPROCABLE ELECTROMAGNETIC DRIVE FOR TYPE BAR ACTUATION IN SAME TYPEWRITER
360  DF  .~ Including electromagnetic return of universal actuator
361  DF  .~ Including actuator to complete depression of selected key or key lever
362  DF  .~ Including universal actuator to actuate selected type-bar action
363  DF  .~.~ And individual solenoids to connect the type-bar action to be actuated
364  DF  .~ Including individual solenoids to actuate the selected type-bar action
365  DF  HAVING ROTATED POWER DRIVE INTERMITTENTLY APPLIED FOR TYPE-BAR ACTUATION
366  DF  .~ Including jam-release means
367  DF  .~ Interposed components driven by filter shaft
368  DF  .~ For repeat-type action
369  DF  .~.~ With prevention of repeat typing
370  DF  .~ Via continously rotated power roll
371  DF  .~.~ And oscillatable cam
372  DF  .~.~ And rotatable cam (e.g., single-lobe cam)
373  DF  .~.~.~ Including double-lobe cam
374  DF  .~.~ And friction leg (e.g., other than by cam)
375  DF  .~.~ Snatch roll
375.1  DF  .~.~.~ Including plural coaxial snatch discs
375.2  DF  .~.~.~ With control of impact force
375.3  DF  .~.~.~ With electromagnetic control of pawl
375.4  DF  .~.~.~ And star wheel
376  DF  .~.~ With control of impact force
377  DF  .~ Via limited-rotation clutch
378  DF  .~.~ Plural cams clutched to drive shaft
379  DF  .~ Via spring drive (e.g., spring-driven snatch roll)
380  DF  .~.~ Including individual spring for each type-bar action
381  DF  .~.~ Including reciprocable common actuator
382  DF  .~ Via reciprocating common actuator
383  DF  TYPE-BAR-ACTION MECHANISM OR TYPE-FACE ON TYPE-BAR OR TYPE-FACE INKER
384  DF  .~ Spring drive for type-bar action
385  DF  .~ With added-motion mechanism for type-bar near print-point
386  DF  .~.~ Including toggle-linkage
387  DF  .~.~ Including momentum accumulator
388  DF  .~.~ Including hammer, roller, or presser mechanism
388.1  DF  .~.~.~ Type-bar pivotable to vicinity of print-point
389  DF  .~.~ With power assist for mechanism
390  DF  .~ With end-thrust mechanism for type-bar
391  DF  .~.~ Type-bar slidable on flat support
391.1  DF  .~.~.~ Driven by gear means
391.2  DF  .~.~.~ Driven by cam means
391.3  DF  .~.~.~ Driven by toggle-linkage
391.4  DF  .~.~.~ With power assist for mechanism
392  DF  .~.~ Including momentum accumulator
393  DF  .~.~ For top-strike or bottom-strike typewriter
394  DF  .~ With type-bar pivot traveling during typing movement of type-bar
395  DF  .~.~ Type-bar pivot on longitudinally movable carriage in top-strike typewriter
396  DF  .~.~ With ink pad on type-bar rest
397  DF  .~ With disconnection of type-bar action during movement thereof
398  DF  .~ With accelerated (e.g., motion amplifying)type-bar action
399  DF  .~.~ By rolling contact between links
399.1  DF  .~.~.~ By key-lever rolling on fulcrum
400  DF  .~.~ By cam-engaging link
401  DF  .~.~ By breaking and straightening toggle-linkages
402  DF  .~.~ By breaking toggle-linkage (e.g., to pull type-bar to print-point)
403  DF  .~.~ By straightening toggle-linkage (e.g., to push type-bar to print-point)
404  DF  .~.~ Including adjustment of toggle-linkage anchor position
405  DF  .~.~ By type-bar connecting link
405.1  DF  .~.~.~ Including gear connection
406  DF  .~.~ By pin and slot connection
407  DF  .~.~ Including type-bar starter means
408  DF  .~ For bottom-strike typewriter
409  DF  .~.~ Including simultaneous actuation of plural type-bars for simultaneous imprinting
410  DF  .~.~ With pivotally mounted platen carrier (e.g., for access, etc.)
411  DF  .~.~ Type-bar actuated by rack and gear
412  DF  .~.~ Including type-bar mounting arrangement
413  DF  .~.~ With type-face inker (e.g., ink-pad rest)
414  DF  .~.~ Including key or key-lever arrangement
415  DF  .~ For top-strike typewriter
416  DF  .~.~ Including type-bars pivoted on both sides of, or above and across, platen axis
417  DF  .~.~ With type-face inker (e.g., ink pad, roller, etc.)
418  DF  .~.~ Type-bar pivoted by gear connection
419  DF  .~.~ Type-member or type-bar pivoted and rotatable (e.g., for selection of type face)
420  DF  .~.~ Type-bar pivoted by push link
421  DF  .~.~ Type-bar pivoted by cam
422  DF  .~ Type-bar action
423  DF  .~.~ Including selectively disengageable type-bar action to render action inoperable
424  DF  .~.~ With type-face pivoted on type-bar for rolling contact with platen
425  DF  .~.~ Including jam-release means
426  DF  .~.~ Including type-bar return before release of key lever
427  DF  .~.~ Including yieldable link in type-bar action
428  DF  .~.~ Including means to limit type-bar movement
429  DF  .~.~ Type-bar pushed or pulled by hooklike cam
430  DF  .~.~ Type-bar pulled to print-point
430.1  DF  .~.~.~ By cam means (e.g., slotted cam, helix, etc.)
430.2  DF  .~.~.~ By toggle-linkage
430.3  DF  .~.~.~ With movable type-bar-segment
431  DF  .~.~ Type-bar moved to print-point by gear drive
432  DF  .~.~ Type-bar moved to print-point by cam means
433  DF  .~.~ Type-bar moved to print-point by toggle-linkage
434  DF  .~.~ Including connecting link or joint
434.1  DF  .~.~.~ Adjustable (e.g., in length, etc.)
434.2  DF  .~.~.~ Flexible (e.g., spring, strap, etc.)
434.3  DF  .~.~.~ Including connecting element (e.g., joint, etc.)
435  DF  .~ Type-bar rebound preventer (e.g., via latch, brake, linkage, etc.)
436  DF  .~ Type-bar return spring connected to type-bar-action linkage
437  DF  .~.~ For impact control
438  DF  .~.~ With adjustment means (e.g., for "touch" control, ect.)
438.1  DF  .~.~.~ Including an indicator
439  DF  .~.~ Attached to type-bar or universal-bar
440  DF  .~.~ Attached to key lever (e.g., tension spring)
440.1  DF  .~.~.~ Compression spring
440.2  DF  .~.~.~ Cantilever spring (e.g., torsion, hairpin, etc.)
441  DF  .~ Type-bar pivot support
442  DF  .~.~ For plural groups of type-bars
442.1  DF  .~.~.~ Having type-bars disposed on plural ring supports
442.2  DF  .~.~.~ Including type-bars pivoted on vertical pivot(s) (e.g., moved in horizontal plane)
443  DF  .~.~ Ring support
444  DF  .~.~ Type-basket laterally movable relative to platen and key-board
445  DF  .~.~ Type-bar-segment (e.g., wire journal)
445.1  DF  .~.~.~ With guide for movement of segment
445.2  DF  .~.~.~ Including hanger for individual type-bar
445.3  DF  .~.~.~.~ And bearing for type-bar
445.4  DF  .~.~.~ Interchangeable (i.e., easily removable) segment
445.5  DF  .~.~.~ With type-bar anvil
446  DF  .~.~ Interconnected (e.g., nested) support bearings
447  DF  .~.~ Ball-and-socket bearing for type-bar (e.g., universal joint)
448  DF  .~.~ Roller bearing or ball bearing for type-bar
448.1  DF  .~.~.~ Including plural bearings for each type-bar
449  DF  .~.~ Adjustable bearing for type-bar
450  DF  .~.~ Pin support for type-bar
451  DF  .~.~ Wire support for type-bars
452  DF  .~ Type-bar structure
453  DF  .~.~ With type-face movable in plane of type-bar movement
454  DF  .~ Type-bar rest or rest support
455  DF  .~.~ Including metallic material
456  DF  .~ Type-bar or type-member guide structure
457  DF  .~.~ Including resilient means for energy absorption or kickback
458  DF  .~.~ Mounted on platen-carriage
459  DF  .~.~ For thrusted type-bar
460  DF  .~.~ Guide adjacent print-point
460.1  DF  .~.~.~ Including rollers or balls
460.2  DF  .~.~.~ Including pin or collar
461  DF  .~.~ Adjustable guide
462  DF  .~ Type-member structure
463  DF  .~.~ Removable type-member
464  DF  .~.~ Rotatable on type-bar
465  DF  .~.~ Pivotable on type-bar
466  DF  .~.~ Type-face or type-die configuration (e.g.,reverse image, boldface, piercing, etc.)
467  DF  .~ Dust guard for type-bar action mechanism
468  DF  .~.~ For type-bar bearing (e.g., shield on type-bar-segment)
469  DF  .~ Attachment to type-bar for imprinting extra character
470  DF  .~ Ink-impregnated type-face or inker for type-face
471  DF  .~.~ Including stationary ink pad for inking type-face directly
471.1  DF  .~.~.~ And a wick for feeding pad from reservoir
472  DF  KEY-BOARD OR KEY LEVER-ACTUATING MECHANISM
473  DF  .~ Including mechanism (e.g., auxiliary key-board) for activating keys
474  DF  .~.~ Electromagnetic key-board-drive mechanism
475  DF  .~.~ Operated by user's leg (e.g., foot, knee, etc.)
476  DF  .~.~ For actuating function key only
477  DF  .~ Including means generating a signal for type selecting or other typing function
478  DF  .~.~ Via slidable code bars
479  DF  .~.~ Via electrical component (e.g., switch, stylus, etc.) in or with key-board
479.1  DF  .~.~.~ Capacitance-responsive switch
479.2  DF  .~.~.~ Electromagnetic-responsive switch
480  DF  .~ Including control of key action (e.g., buffer, etc.)
481  DF  .~.~ By regulating key force or movement (e.g., key dip or stroke)
482  DF  .~ For stenographic typewriter
483  DF  .~ For Braille typewriter
484  DF  .~ For foreign-language typewriter
485  DF  .~ Key-board having multiple-character, multiple-movement keys
486  DF  .~ Key-board arranged according to character location
487  DF  .~.~ Color-coded key-board
488  DF  .~ Key-board including row of keys having different heights
489  DF  .~ Key-board including keys grouped to facilitate positioning of typist's fingers
490  DF  .~ Key-cap or key-stem structure
491  DF  .~.~ Including cushioning means (e.g., yieldable surface)
491.1  DF  .~.~.~ Including underlying air cushion
491.2  DF  .~.~.~ Including spring supporting key cap or key stem
491.3  DF  .~.~.~.~ With sensory indicator (e.g., sound, tactile response, etc.)
492  DF  .~.~ Adjustable in plane of key(s) (e.g., to facilitate reach, rotatable, etc.)
493  DF  .~.~ Including character-bearing disc on key cap
493.1  DF  .~.~.~ Secured by encircling ring member
493.2  DF  .~.~.~.~ With slot for exchanging disc
494  DF  .~.~ Having raised or recessed character
495  DF  .~.~ Including means for mounting key cap or key stem
495.1  DF  .~.~.~ By spring means
496  DF  .~ Key lever or space-bar mounting structure (e.g., dust guard, buffer, pivot, etc.)
497  DF  WITH CONTROL OF "CARBON PAPER" FOR TYPING PLURAL SIMULTANEOUS COPIES BY SINGLE IMPRESSION (E.G., ON "MANIFOLD SET")
498  DF  .~ Including prevention of full imprint on "carbon copy" record-medium
499  DF  .~ On record-medium wound around platen together with carbon paper
500  DF  .~ With means for causing slack in web of manifold set
501  DF  .~.~ By arcuate movement of carbon paper carrier
502  DF  .~.~ By clamp on carbon paper carrier
503  DF  .~ By use of other than rectangular sheet carbon paper (e.g., disc, etc.)
504  DF  .~.~ Endless-band carbon paper
505  DF  .~ By multicolor carbon paper
506  DF  .~ With means to prevent creep (e.g., relative movement) between record-media
507  DF  .~ Including means for creep feed of carbon paper
508  DF  .~ Including spool or support for roll of carbon paper
509  DF  .~.~ Including a flat roll or core therefor
510  DF  .~.~ And guide for changing feed direction
510.1  DF  .~.~.~ Spool support shiftable to and from platen
511  DF  .~.~ Feed mechanism for feed from roll of carbon paper
511.1  DF  .~.~.~ Responsive to return of carriage
511.2  DF  .~.~.~ With retraction of carbon paper for reuse thereof (e.g., by slidable carrier)
511.3  DF  .~.~.~.~ Carbon paper rewound for retraction
511.4  DF  .~.~.~.~.~ By driving carbon paper roll directly from platen (e.g., by endless band)
512  DF  .~.~ And support for roll of record-medium
513  DF  .~ Including relative movement between carbon paper and record-medium
514  DF  .~.~ Including positioning of auxiliary record-medium
515  DF  .~.~ Including front insertion of carbon paper or record-medium
516  DF  .~.~ By simultaneously advancing record-medium and retracting carbon paper
517  DF  .~.~ By means to arrest advance of carbon paper
518  DF  .~.~ Carbon paper carrier(s) respositionable relative to platen
518.1  DF  .~.~.~ Plural carriers disposed side-by-side for selective use singly or simultaneously
518.2  DF  .~.~.~ Plural carries for serial retraction of plural carbon papers
518.3  DF  .~.~.~ With means to imprint selectively on one or more media (e.g., by holding selected media away from print-line)
518.4  DF  .~.~.~ Including retraction of carbon paper and record-medium and subsequent advance of record-medium
519  DF  .~.~.~ Carbon paper carrier movable rectilinearly
519.1  DF  .~.~.~.~ With means to hold record-medium against retraction
519.2  DF  .~.~.~.~ Including means to reduce binding of carbon paper during retraction
519.3  DF  .~.~.~.~.~ Including lifting of platen for retraction of carrier
519.4  DF  .~.~.~.~.~ With guard over settable parts (e.g., denominational jacks, etc.)
519.5  DF  .~.~.~.~.~ With relative movement betweem record media (e.g., for condensed-billing, etc.)
519.6  DF  .~.~.~.~ With support or guiding or positive-driving structure for carrier (e.g., table, adjustable stop, etc.)
519.7  DF  .~.~.~ Carbon paper carrier on endless member
520  DF  .~ Carbon paper holder (e.g., loading board, etc.)
521  DF  FOR TYPING ON CARD IN CARD HOLDER
522  DF  .~ Flexible holder fed around platen with single card
523  DF  .~ On card pierced or indented to aid holding
524  DF  .~ Holder movable responsive to case-shift
525  DF  .~ Card holder carrier by platen
526  DF  .~.~ And actuated in response to platen rotation
527  DF  .~.~ With platen surface modified for card
527.1  DF  .~.~.~ Including card gripper on platen
527.2  DF  .~.~.~ Including axially extending slot or hollow in platen
528  DF  .~.~ Holder attached via detachable arms at ends of platen
529  DF  .~.~ Holder attached via pins on holder or via adhesive attachment
530  DF  .~.~ Holder attached via element (e.g., band) gripping platen periphery
531  DF  .~ Including line-spacing of holder or card
532  DF  .~.~ Variable line-spacing (e.g., platen creep)
533  DF  .~.~ In a curvilinear path
534  DF  .~.~ By pinion and rack
535  DF  .~ Including support engaging bottom edge of card
536  DF  .~ Card holder mounted on typewriter frame
537  DF  .~.~ Including means enabling movement of card relative to holder
538  DF  .~.~ Transparent card holder
539  DF  .~.~ Including finger movable away from holding position
540  DF  .~.~.~ Spring urged to holding position
541  DF  .~ Including a feed-roller
542  DF  .~ Card holder mounted on platen-carriage frame
543  DF  .~ Including gripper or means urging card against platen
544  DF  .~ Backing for stencil cutting (e.g, celluloid strip, etc.)
545  DF  FOR LINE-SPACING BY INCREMENTAL ROTATION OF PLATEN
546  DF  .~ To facilitate condensed billing (i.e., by determining a desired limit or amount of retrograde or advance platen movement)
547  DF  .~.~ Including stop structure (e.g, traveling stop, etc.)
547.1  DF  .~.~.~ For arresting platen at limit of both retrograde and advance movement
547.2  DF  .~.~.~.~ By stop travelling in a rectilinear path
547.3  DF  .~.~.~.~ By lever or push-rod drive for platen
547.4  DF  .~.~.~.~.~ Via gear drive
547.5  DF  .~.~.~.~.~.~ Including lever on axis transverse to platen axis
547.6  DF  .~.~.~.~.~.~ Including relatively adjustable coaxial gear segments
547.7  DF  .~.~.~.~.~ Via pawl and ratchet wheel drive
547.8  DF  .~.~.~.~.~.~ With spring motor
548  DF  .~.~ With graduated scale (e.g., on drum periphery)
549  DF  .~ Actuated by key on key-board
550  DF  .~ For multi-incremental rotation (e.g., "platen sweep")
551  DF  .~ For line-spacing in forward or reverse direction
552  DF  .~ With "floating" platen
553  DF  .~ Via line-space / carriage-feed-release actuator
554  DF  .~ For facilitating even wear of platen surface (e.g., by irregular increments, etc.)
555  DF  .~ By irregular increments of platen rotation (e.g., for adjustment of platen relative to its actuator, etc.)
556  DF  .~.~ Including disconnecting ratchet wheel from platen (e.g., declutching ratchet, etc.)
556.1  DF  .~.~.~ Via relatively displaceable pin and slot members
556.2  DF  .~.~.~ Via toothed ring and locking member(s)
556.3  DF  .~.~.~.~ Including pivotable locking member(s)
556.4  DF  .~.~.~.~ Including radially displaceable locking member(s)
557  DF  .~.~.~ Via ball or roller clutching member(s)
558  DF  .~.~.~ Via binding jaws gripping annular flange between jaws
559  DF  .~.~.~ Via friction plate members engageable by axial displacement (e.g., pressure plate, etc.)
559.1  DF  .~.~.~.~ Friction members have cooperating conical surfaces
560  DF  .~.~.~ Via frictional engagement of periphery of cylindrical member
560.1  DF  .~.~.~.~ Friction member(s) acting on inner periphery of drum
560.2  DF  .~.~.~.~.~ Pivotable member(s)
561  DF  .~.~.~.~.~ Expandable band or split ring
562  DF  .~.~ Including settable stops
563  DF  .~.~ Including plural detents selectively engageable with ratchet wheel
564  DF  .~.~ Including a drive member engageable with line-space ratchet wheel
564.1  DF  .~.~.~ Via displaceable detent
565  DF  .~.~ Detent-release structure
566  DF  .~.~.~ With friction brake for platen
566.1  DF  .~.~.~ With simultaneous disengagement of drive pawl
567  DF  .~.~ Including gear (e.g., differential gear, etc.) structure
568  DF  .~ By electric-power drive
569  DF  .~ By gear train (e.g., including a clutch)
570  DF  .~ By double-cam drive
571  DF  .~ By friction drive (e.g., including regulation of increments)
572  DF  .~ By pawl and ratchet wheel drive
573  DF  .~.~ Including rectilinearly movable pawl
573.1  DF  .~.~.~ And resilient drive
574  DF  .~.~ Including pawl carrier coaxial with ratchet wheel
574.1  DF  .~.~.~ And means to regulate pawl engagement or drive
575  DF  .~.~ Including means to regulate pawl engagement or drive
575.1  DF  .~.~.~ By movable ratchet-wheel shield
575.2  DF  .~.~.~ By stop adjustable to limit movement of actuator
576  DF  .~ Via foldable line-space actuator
577  DF  .~ With means to prevent reverse rotation or ensure full increment (e.g., for "backlash" prevention)
578  DF  SHEET OR WEB (E.G., RECORD-MEDIUM FEEDING MECHANISM)
579  DF  .~ Including skew correction responsive to position of sheet or web
580  DF  .~ Including forming indicia on record-medium during typing to find next line to be typed
581  DF  .~.~ To find last-produced slit or hole or notch in sheet
582  DF  .~ Including programmed-control-system for record-medium feed (e.g., on auxiliary record)
583  DF  .~.~ For web record-medium
583.1  DF  .~.~.~ Program on auxiliary-record tape
583.2  DF  .~.~.~ Program is indicia on rotatable disc or drum
583.3  DF  .~.~.~ Program is indicia on record-medium
583.4  DF  .~.~.~ Including plural speed record-medium feed
584  DF  .~ Including feed of plural record-media arranged side-by-side (e.g., fed independently of platen)
585  DF  .~.~ By divided platen
585.1  DF  .~.~.~ With positive clutch for simultaneous rotation of platen sections
586  DF  .~ Including feed of tally strip record-medium (e.g., plural tally strips)
587  DF  .~.~ And feed of endless transfer-medium
588  DF  .~.~ On plural-platen (e.g., divided platen) typewriter
589  DF  .~.~ With locking or interlocking mechanism (e.g., line lock, etc.)
590  DF  .~.~ Including feed varied for amount of tally strip on spool
591  DF  .~.~ Including tally-strip feed transverse to feed of main record-medium
592  DF  .~.~ Including feed independent of platen
593  DF  .~.~ With cutting or spring tensioning of tally strip
594  DF  .~.~ Including structure or mounting or adjustment of tally-strip roll
594.1  DF  .~.~.~ And roll for transfer-medium
595  DF  .~ Including insertion of sheet from front of platen (e.g., for "condensed billing", via sheet guide, etc.)
596  DF  .~.~ Including feed responsive to presence of sheet
597  DF  .~.~ With subsequent line-spacing independent of platen
598  DF  .~.~ With digitally selected, typewriter-actuated feed to selected line to be typed (e.g., via "dialing" disc, etc.)
599  DF  .~.~ Insertion of sheet relative to other record-medium
599.1  DF  .~.~.~ With sheet-associating attachment (e.g., collating-table, etc.)
600  DF  .~.~ Via feed throat having gate (e.g., actuated by power, etc.)
600.1  DF  .~.~.~ With platen repositioned for sheet insertion
600.2  DF  .~.~.~ With feed-roller repositioned for sheet insertion
600.3  DF  .~.~.~.~ And sheet feed by additional feed-roller couple
600.4  DF  .~.~.~.~ Coincident to pivoting of sheet guide
601  DF  .~.~ With laterally movable sheet holder (e.g., having concurrent feed movement)
602  DF  .~.~ With sheet ejector
603  DF  .~.~ Via chute(s) or feed-roller couple (e.g., plural chutes)
603.1  DF  .~.~.~ Pivotable chute
604  DF  .~.~ Attachment to typewriter for converting to condensed-billing operation
605  DF  .~ For feeding plural record media concurrently or selectively
606  DF  .~.~ Plural webs superimposed and aligned to each other during typing
607  DF  .~.~ Including movement of one record-medium relative to another
607.1  DF  .~.~.~ In lateral direction (e.g., lateral shift of web or sheet carrier)
607.2  DF  .~.~.~ By insertion of additional record-medium
607.3  DF  .~.~.~ With concurrent feed-roller and line-spacing control
608  DF  .~.~.~ With clamp for holding one record-medium stationary
608.1  DF  .~.~.~.~ Selectively engageable feed-rollers or feed-roller brakes
608.2  DF  .~.~.~ By auxiliary feed-roller or platen section (e.g., separate feed of sheets)
608.3  DF  .~.~.~ By retrograde movement of one record-medium
608.4  DF  .~.~.~ Including differential movement by separate drive means
609  DF  .~.~ Mount for plural web rolls
610  DF  .~.~ Including sheet-associating attachment (e.g., pin-band-encircling platen)
610.1  DF  .~.~.~ With table or frame (e.g., collating-table)
610.2  DF  .~.~.~.~ Front collating-table with sheet-holding means (e.g., clamps)
610.3  DF  .~.~.~.~.~ Including pin-holding means
610.4  DF  .~.~.~.~.~ Including indicator
611  DF  .~ For feeding web record-medium
612  DF  .~.~ Feeding web or sheet in perpendicular directions
613  DF  .~.~ With web supply or takeup or mount therefor (e.g., web cartridge, etc.)
613.1  DF  .~.~.~ Including insertion of leading edge of web
613.2  DF  .~.~.~ For folded or creased web (e.g., fan-folded web)
613.3  DF  .~.~.~.~ With web smoother
613.4  DF  .~.~.~.~ Holder for fan-folded web mounted to move with carriage
614  DF  .~.~.~ Including web rewind
614.1  DF  .~.~.~.~ Connected to platen drive
615  DF  .~.~.~ Mounted on typewriter having transversely moving carriage
615.1  DF  .~.~.~.~ Mounted to move with carriage
615.2  DF  .~.~.~ For feeding tape in direction of print-line (i.e., transverse feed)
616  DF  .~.~ By pin-feed means (e.g., reciprocating pin, etc.)
616.1  DF  .~.~.~ Including laterally adjustable bands (e.g., tractor feed, etc.)
616.2  DF  .~.~.~ Pin feed on endless band
616.3  DF  .~.~.~ Pin wheel (e.g., on platen cylinder)
617  DF  .~.~ By friction-feed means (e.g., reciprocating finger or gripper or pinch roller, etc.)
618  DF  .~.~ With web tensioning or braking
619  DF  .~.~ Including web guiding or aligning (e.g., laterally, relative to print-line, etc.)
620  DF  .~.~ Including web shifting to view print-line
621  DF  .~.~ With web cutter (e.g., tear bar, wire tool, etc.)
621.1  DF  .~.~.~ For longitudinal cut
621.2  DF  .~.~.~ And gauge for tear-off length
622  DF  .~ With holder for single sheet (e.g., clip, backing sheet, etc.)
623  DF  .~.~ Mounted on carriage (e.g., for extra-wide sheet, cylindroidal holder, etc.)
624  DF  .~ For feeding sheet from stack or pack holder
625  DF  .~.~ And delivering to sheet receiver (e.g., by roller couple)
626  DF  .~.~ By engaging between flap and body of envelope
627  DF  .~.~ By pneumatic means
628  DF  .~.~ By reciprocating of oscillating member
629  DF  .~.~ By endless-band or rotating (e.g., feed-roller) member
630  DF  .~ Including aligning of sheet edge prior to typing
631  DF  .~.~ Aligner moved to operate concurrently with disengagement of feed means
632  DF  .~.~ Including leading-edge aligner located past print-point
632.1  DF  .~.~.~ Adjustable leading-edge aligner
633  DF  .~.~ Side-edge aligner (e.g., adjustable, etc.)
633.1  DF  .~.~.~ On rear sheet table or apron
633.2  DF  .~.~.~.~ Adjustable aligner (e.g., with lock)
634  DF  .~ Including friction-feed means (e.g., band)
635  DF  .~.~ By endless-feed band
636  DF  .~.~ By roller couple (e.g., rotatable pinch rollers, etc.)
636.1  DF  .~.~.~ With typewriter-actuated control of feed-roller position
636.2  DF  .~.~.~ Including intermediate drive means (e.g., gears) connecting feed-roller to platen
636.3  DF  .~.~.~ Including feed-roller having equalizing or pressure-adjusting means
637  DF  .~.~.~ Including lower feed-roller(s) (e.g., pressure roller, etc.)
637.1  DF  .~.~.~.~ Including concurrent control for disengagement of upper and lower feed rollers
637.2  DF  .~.~.~.~ Mounted on apron
637.3  DF  .~.~.~.~ Mounted on plural roller carriers
637.4  DF  .~.~.~.~.~ Including plural parallel carrier pivots
637.5  DF  .~.~.~.~.~ Including single carrier pivot intermediate front and rear lower feed rollers
637.6  DF  .~.~.~.~ Mounted on single carrier having pivot intermediate front and rear lower feed-rollers
638  DF  .~.~.~ Including feed or pressure roller mounted on "paper-finger"
639  DF  .~.~.~ Including upper feed-roller(s) (e.g, pressure roller, etc.)
639.1  DF  .~.~.~.~ Mounted on "paper bail"
639.2  DF  .~.~.~.~.~ Disengaged from platen by compound movement of bail (e.g., on double pivoted mount)
640  DF  .~.~.~ With cooperating scale
641  DF  .~.~.~ Feed-roller structure or brake or spacer therefor
642  DF  .~ Including sheet guide (e.g., for sheet insertion, etc.)
643  DF  .~.~ Platen-encircling band
644  DF  .~.~ Sheet stripper (e.g., for preventing reentry, etc.)
645  DF  .~.~ Sheet holddown member (e.g., "paper-finger", end-of-page holddown, etc.)
645.1  DF  .~.~.~ With aperture or notch (e.g., for typing therethrough, etc.)
645.2  DF  .~.~.~ On or with erasing plate or signal or indicator
645.3  DF  .~.~.~ Movably mounted on movable finger carrier
645.4  DF  .~.~.~ Pivotally mounted holddown
645.5  DF  .~.~.~ Mounted in front of platen axis
646  DF  .~.~ Sheet table at delivery side of platen
647  DF  .~.~ Movable sheet table or apron (e.g., detachable, extensible, etc.)
647.1  DF  .~.~.~ Pivotable (e.g., fingerlike support)
648  DF  PLATEN OR PLATEN-MOVING MECHANISM
649  DF  .~ For movement of platen other than for line-spacing
650  DF  .~.~ Cylindrical platen adjustable to facilitate compactness
651  DF  .~.~ Cylindrical platen axially adjustable
652  DF  .~.~ Platen movment conjointly with type-face movement
653  DF  .~.~ By eccentric mounting for platen
654  DF  .~ Character-size platen (e.g., anvil, disc, etc.)
655  DF  .~.~ Mounted on movable carrier
656  DF  .~ Bar (i.e., line size) platen
657  DF  .~.~ Mounted on cylindrical member
658  DF  .~ Semicylindrical platen
659  DF  .~ Cylindrical platen
660  DF  .~.~ Detachably secured to platen carriage
660.1  DF  .~.~.~ By axially displaceable supporting shaft
660.2  DF  .~.~.~ By pivoted member overlying platen shaft
660.3  DF  .~.~.~ By disengageable platen sectors
661  DF  .~.~ With sound-muffling means
661.1  DF  .~.~.~ Including plural layers of varying hardness
661.2  DF  .~.~.~ Including cylinder containing fluent (e.g., fluid, etc.) material
661.3  DF  .~.~.~ Including cylindrical sections or rings (e.g., of character-space width)
661.4  DF  .~.~.~ Including a wound member
662  DF  .~.~ Including particular surface characteristic (e.g., translucent, pigment yielding, corrugated, of varying hardness, etc.)
663  DF  LOCKING OR INTERLOCKING MECHANISM
664  DF  .~ For interlocking plural functions or mechanisms
665  DF  .~.~ Plural carriage-moving mechanisms (e.g., escapement, tabulation, etc.)
666  DF  .~.~ Plural keys or key linkages (e.g., for type-face selection, etc.)
667  DF  .~ Key-board lock using interlock mechanism
668  DF  .~ Locking means actuated in response to a condition
669  DF  .~.~ Failure of power supply
670  DF  .~.~ End-of-page lock (e.g., responsive to preset condition)
670.1  DF  .~.~.~ Responsive to end-of-page sensor
670.2  DF  .~.~.~ Including lock for platen or line-space
670.3  DF  .~.~.~.~ By cam groove and follower
671  DF  .~.~ End of maximum typed line
671.1  DF  .~.~.~ Actuated by space-bar
671.2  DF  .~.~.~ Universal-bar lock (e.g, pivoted latch, slidable latch, etc.)
671.3  DF  .~.~.~.~ Actuated by paper-finger
671.4  DF  .~.~.~.~ Interposed component
672  DF  .~.~.~ Escapement lock
672.1  DF  .~.~.~ Type-bar lock
672.2  DF  .~.~.~ Key-lever lock (e.g., by hook on key-lever)
673  DF  .~.~ Coin-controlled lock (e.g., responsive to print-lines, time, etc.)
674  DF  .~ For locking carriage in centered position (e.g., with shipping support)
675  DF  .~.~ And disengaging case-shift lock
676  DF  .~ Key-board security lock (e.g., cover plate, etc.)
677  DF  .~ For locking selected group(s) of keys
678  DF  .~ For locking key in actuated position (e.g., to remove type-face from ink pad)
679  DF  MEANS AUXILIARY TO TYPEWRITING FUNCTION
680  DF  .~ Means for collapsing typewriter or support for record-medium or copy
681  DF  .~.~ By tilting typewriter (e.g., via collapsible legs, etc.)
682  DF  .~.~ By moving key-board relative to frame (e.g., into plural operating positions, etc.)
683  DF  .~.~ By moving carriage relative to frame
684  DF  .~.~ By moving type-bars relative to frame
685  DF  .~.~ Including typewriter built into carrying case
686  DF  .~ Buffer (e.g., dashpot, of particular material, etc.) for movable typewriter element
687  DF  .~.~ Having nonimpact movement
688  DF  .~ Means for increasing typewriter noise
689  DF  .~ Means for muffling typewriter noise
690  DF  .~.~ By sound-barrier enclosure for typewriter (e.g., by sound-absorbing material)
690.1  DF  .~.~.~ With viewing window (e.g., having reflection eliminator)
690.2  DF  .~.~.~.~ And externally protruding (e.g., key-board, etc.) operating means
690.3  DF  .~.~.~ With externally protruding operating means
690.4  DF  .~.~.~ Including means facilitating opening of enclosure
691  DF  .~ Frame, casing, or support for typewriter
692  DF  .~.~ Having means facilitating interchange of parts
693  DF  .~.~ Housing structure
693.1  DF  .~.~.~ For ink-ribbon spool (e.g., spool cover, etc.)
694  DF  .~.~ Made of particular material (e.g., plastic, etc.)
695  DF  .~ Means for correcting typing errors (e.g., by abrasive eraser, etc.)
696  DF  .~.~ By laser beam or adhesive-surface ribbon or chemical eradicator
697  DF  .~.~ By overprinting (e.g, with coated material) to cancel error
697.1  DF  .~.~.~ With drive for ribbon having coating thereon
698  DF  .~.~ With erasing table
699  DF  .~.~ With receptacle for refuse
700  DF  .~.~ With means for rubbing eraser over surface of record-medium
701  DF  .~ Means for cleaning, or facilitating cleaning of, type-face
702  DF  .~.~ By contacting type-face (e.g., via type-face cleaner, brush, etc.)
702.1  DF  .~.~.~ Including means for moving brush
703  DF  .~ Indicator means
704  DF  .~.~ For indicating typist's skill or needed adjustment
705  DF  .~.~ For indicating position of carriage along print-line
705.1  DF  .~.~.~ Of carriage for type-head-carrier
705.2  DF  .~.~.~ With word counter
705.3  DF  .~.~.~ By means driven from carriage (e.g., for indicating end of print-line, etc.)
705.4  DF  .~.~.~ Scale for facilitating tabulation
705.5  DF  .~.~.~ Scale for facilitating centering of print-line
706  DF  .~.~ For indicating position of line or end-of-page
706.1  DF  .~.~.~ By scale mounted on paper table
707  DF  .~.~.~ By means driven from platen cylinder
707.1  DF  .~.~.~.~ Drive initiated by detector of record-medium
707.2  DF  .~.~.~.~ Including relatively movable pointer and scale (e.g., rotatable or rectilinearly movable pointer)
707.3  DF  .~.~.~.~.~ Scale rotated by gear drive
707.4  DF  .~.~.~.~.~ Rotatable scale coaxial with platen cylinder
707.5  DF  .~.~.~.~ With line numbering
708  DF  .~.~.~ Including detector of record-medium
708.1  DF  .~.~.~.~ Having electrical contacts separated by record-medium
709  DF  .~.~ For aligning record-medium with print-point or print-line (e.g., for facilitating correction of error, etc.)
709.1  DF  .~.~.~ By transparent indicator
709.2  DF  .~.~.~ For indicating print-line alignment
710  DF  .~.~ Including a page counter
711  DF  .~.~ Including a light
712  DF  .~.~ Including means producing an audible sound (e.g., plural tones, etc.)
713  DF  .~ Attachment for shielding or screening record-medium or typewriter (e.g., against wind, etc.)
714  DF  .~.~ For screening key-board
715  DF  .~ Attachment for guiding fingers or hands of typist (e.g., hand rest)
716  DF  .~ Attachment for illuminating or viewing (e.g., prism, etc.)
717  DF  .~ Attachment for holding an article (e.g., pencil, eraser, etc.)
718  DF  .~.~ Copyholder
718.1  DF  .~.~.~ Actuated by typewriter (e.g., to simulate line-spacing, for web copy, etc.)
718.2  DF  .~.~.~.~ With adjustment of line-spacing
719  DF  MISCELLANEOUS
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CROSS-REFERENCE ART COLLECTIONS
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900  DF  CHEMICAL-SYMBOL CHARACTER
901  DF  CONTINUOUSLY ROTATING TYPE-HEAD
902  DF  STEPPING-MOTOR DRIVE FOR WEB FEED
903  DF  STEPPING-MOTOR DRIVE FOR CARRIAGE FEED
904  DF  SUBSCRIPT OR SUPERSCRIPT CHARACTER