US PATENT SUBCLASS 178 / 23 R
.~ Printing

Current as of: June, 1999
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178 /   HD   TELEGRAPHY

2 R  DF  SYSTEMS {21}
23 R.~ Printing {8}
24  DF  .~.~> Bulletin
25  DF  .~.~> Page {3}
30  DF  .~.~> Character elements
31  DF  .~.~> Multiple-line circuit {1}
33 R  DF  .~.~> Selectors {3}
35  DF  .~.~> With type-wheel recorder
36  DF  .~.~> Recorders {3}
23 A  DF  .~.~> Error detection in printers

Unofficial Alpha Subclasses: R A

DEFINITION

Classification: 178/23

(under subclass 2) Systems for recording messages in typed letters or characters by impression or contact upon a suitable recording surface--as a tape, strip, sheet, or page--by means of type-wheels or type-levers, typewriters, or the like, actuated by current variations transmitted over one or more lines or conductors less in number than the number of characters of transmitting keys used.

SEE OR SEARCH THIS CLASS, SUBCLASS:

4, for teles:graphic printing systems employing automatic transmitters.

SEE OR SEARCH CLASS

318, Electricity: Motive Power Systems,

41+, for synchronizers of general application.

341, Coded Data Generation or Conversion, 20+, for bodily actuated code generators of general application.

345, Computer Graphics Processing, Operator Interface Processing, and Selective Visual Display Systems,

168+, for selective electrical control of image or message display system with a keyboard input means.

400, Typewriting Machines,

70+, and appropriate indented subclasses for typewriters operated by electromagnetic power or for systems in which the number of connecting transmission lines is the same as the number of keys or electromagnets connected thereby. In the typewriters of this group the electric operation replaces the mechanical actuation.