| | CLASS NOTES |
| 2 | DF | ANGLE MEASUREMENT RECORDER FOR OPTICAL INSTRUMENTS |
| 3 | DF | PERFORMANCE OF MULTIPLE FUNCTIONS OF STEAM AND GAS ENGINES {1} |
| 7 | DF | RECORD TRACER MOVEMENT RESPONSIVE TO INERTIA OR MASS INCLINATION |
| 8 | DF | COURSE |
| 9 | DF | WEIGHT RECORDERS, BY PRINTING OR PERFORATING {2} |
| 13 | DF | COMBINED WITH NON-RECORDING INTEGRATOR |
| 14 R | DF | COMBINED WITH NON-RECORDING REGISTER {2} |
| 17 | DF | COMBINED WITH NON-RECORDING INDICATOR OR ALARM {1} |
| 19 | DF | COMBINED WITH AUTOGRAPHIC APPARATUS |
| 20 | DF | COMBINED WITH CLOCK |
| 21 | DF | COMBINED WITH RECORD DELETING MEANS |
| 22 | DF | COMBINED WITH RECORD RECEIVER DEPOSIT RECEPTACLE OR RECORD RECEIVER THROUGH CHUTE |
| 23 | DF | COMBINED WITH FIDUCIAL LINE MAKING |
| 24 | DF | COMBINED WITH RECORD RECEIVER SEVERER |
| 25 | DF | COMBINED WITH OTHER NON-RECORDING DEVICES |
| 26 | DF | AUTOGRAPH AS SOLE RECORD, TIME DRIVEN ELEMENT |
| 27 | DF | CHECK RECEIVERS, SELECTIVE COMPARTMENT |
| 28 | DF | EXTENT OF WEB ADVANCE AS SOLE MEASURE OF FUNCTION |
| 29 | DF | MULTIFACTOR-DRIVEN RECORDER ELEMENT {1} |
| 31 | DF | FOLLOW-UP |
| 32 | DF | REBALANCING SYSTEMS |
| 33 R | DF | COMBINED WITH EXTERNAL RECORDER OPERATING MEANS {22} |
| 44 | DF | PLURAL RECORDERS |
| 45 | DF | PLURAL-FUNCTION RECORDER, DISTINGUISHABLE RECORDINGS {4} |
| 65 | DF | SINGLE FUNCTION RECORDER, SINGLE SCALE, VARIABLE VALUE |
| 66 | DF | SINGLE FUNCTION RECORDER, DUPLICATE OR PORPORTIONAL SCALE RECORDS {1} |
| 68 | DF | RECORD RECEIVER REMOVAL AND MARKER DISPLACEMENT |
| 69 | DF | RECORD ELEMENT FRICTION ELIMINATING VIBRATOR |
| 70 | DF | RECORD RECEIVER EXPANSION AND MARKER POSITION SHIFT |
| 71 | DF | UNDULATORY RECORD, CONSTANT AMPLITUDE |
| 72 | DF | FLOAT RESPONSIVE OR EXPANSIBLE CHAMBER RESPONSIVE MARKER |
| 73 | DF | CENTRIFUGAL GOVERNOR RESPONSIVE MARKER |
| 150.1 | DF | ELECTRIC RECORDING {2} |
| 74.2 | DF | MAGNETOGRAPHIC {5} |
| 76.1 | DF | THERMAL RECORDING |
| 77 R | DF | RECORD RECEIVER DEFORMING {1} |
| 78 | DF | PRINTING, DOTTING, OR PUNCHING MARKER {9} |
| 107.1 | DF | LIGHT OR BEAM RECORDING {3} |
| 111 | DF | WRITERS {2} |
| 134 | DF | RECORD RECEIVERS AND/OR DRIVING MEANS THEREFOR {4} |
| 139 R | DF | MARKERS AND/OR DRIVING MEANS THEREFOR {7} |
| 144 | DF | WATCHMAN'S OR WORKMAN'S KEY OR KEY ENCLOSING BOX |
| 145 | DF | INSTRUMENT SUPPORT INSTRUMENT PART SUPPORT |
| 146 | DF | MISCELLANEOUS |
