US PATENT SUBCLASS 434 / 229
.~.~ Means for selectively rendering key operable or inoperable

Current as of: June, 1999
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434 /   HD   EDUCATION AND DEMONSTRATION

219  DF  OCCUPATION {8}
227  DF  .~ Keyboard operation (e.g., typing, key punching, etc.) {5}
229.~.~ Means for selectively rendering key operable or inoperable

DEFINITION

Classification: 434/229

Means for selectively rendering key operable or inoperable:

(under subclass 227) Subject matter including means to lock one or more keys of a keyboard in an inoperable position and means to release a selected key so that it can be depressed.