US PATENT SUBCLASS 340 / 314
.~.~ Noncorrespondence alarm (e.g., if acknowledgement is incorrect)

Current as of: June, 1999
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340 /   HD   COMMUNICATIONS: ELECTRICAL

286.01  DF  SYSTEMS {24}
313  DF  .~ Answer back {1}
314.~.~ Noncorrespondence alarm (e.g., if acknowledgement is incorrect)

DEFINITION

Classification: 340/314

(under subclass 313) Subject matter having means to sound an alarm if the answer to the interrogation is improper.