US PATENT SUBCLASS 340 / 297
.~.~ With signal at box (e.g., preliminary signal to combat false alarms)

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.~.~ With signal at box (e.g., preliminary signal to combat false alarms) {3}
298  DF  .~.~.~> Answer back signal acknowledges transmitted signal
299  DF  .~.~.~> Simultaneous (e.g., actuated by transmitted signal)
300  DF  .~.~.~> Lamp at box (e.g., to call patrolman)

DEFINITION

Classification: 340/297

(under subclass 287) Subject matter provided with means to exhibit indications at the signal box from which the signals are transmitted, so that said box also acts as a receiver.

(1) Note. The signal box, when operated, for example, may produce a preliminary signal of the audible type at the box

to discourage would be pranksters from turning in a false alarm.