US PATENT SUBCLASS 340 / 504
.~.~ Answer-back

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

500  DF  CONDITION RESPONSIVE INDICATING SYSTEM {6}
501  DF  .~ With particular system function (e.g., temperature compensation, calibration) {8}
504.~.~ Answer-back

DEFINITION

Classification: 340/504

Answer-back:

(under subclass 501) Subject matter where a signal indicative of receipt of the indication is returned to the location originating the alarm.

(1) Note. See subclass 502 Note for distinction between answer-back and acknowledgement systems.