US PATENT SUBCLASS 340 / 298
.~.~.~ Answer back signal acknowledges transmitted signal

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

286.01  DF  SYSTEMS {24}
287  DF  .~ Signal box type (e.g., to call messenger, plural fire alarm boxes) {11}
297  DF  .~.~ With signal at box (e.g., preliminary signal to combat false alarms) {3}
298.~.~.~ Answer back signal acknowledges transmitted signal

DEFINITION

Classification: 340/298

(under subclass 297) Subject matter having means to send an answer-back signal to notify the operator that the transmitted signal has been received.