US PATENT SUBCLASS 250 / 227.22
.~.~.~.~ Keyboard or other manual switch controlled

Current as of: June, 1999
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250 /   HD   RADIANT ENERGY

200  DF  PHOTOCELLS; CIRCUITS AND APPARATUS {11}
216  DF  .~ Optical or pre-photocell system {11}
227.11  DF  .~.~ Light conductor {14}
227.21  DF  .~.~.~ With light chopping or modulation {1}
227.22.~.~.~.~ Keyboard or other manual switch controlled

DEFINITION

Classification: 250/227.22

Keyboard or other manual switch controlled:

(under subclass 227.21) Subject matter in which the means to operate the light gate or modulator is a manually operable switch or keyboard.

SEE OR SEARCH THIS CLASS, SUBCLASS:

229, for light chopping or modulation type pre-photocell optical systems.

SEE OR SEARCH CLASS

341, Coded Data Generation or Conversion,

31, for photocell controlled keyboard coders which include code conversion data processing.