US PATENT SUBCLASS 340 / 295
.~.~ Noninterfering (prevents break-in by another box during transmission)

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}
295.~.~ Noninterfering (prevents break-in by another box during transmission) {1}
296  DF  .~.~.~> Key obstruction type

DEFINITION

Classification: 340/295

(under subclass 287) Subject matter provided with means for preventing the transmission of signals from any other box or other signals from the same box while any signal is being transmitted therefrom and until such signal is completed.