US PATENT SUBCLASS 714 / 813
.~.~ Two key-down detector

Current as of: June, 1999
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714 /   HD   ERROR DETECTION/CORRECTION AND FAULT DETECTION/RECOVERY

799  DF  ERROR/FAULT DETECTION TECHNIQUE {6}
811  DF  .~ Forbidden combination or improper condition {7}
813.~.~ Two key-down detector

DEFINITION

Classification: 714/813

Two key-down detector:

(under subclass 811) Subject matter in which the improper condition is the simultaneous activation of two or more keys on a data input device.