US PATENT SUBCLASS 340 / 303
.~.~ Frangible element must be broken to send signal

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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}
303.~.~ Frangible element must be broken to send signal

DEFINITION

Classification: 340/303

(under subclass 287) Subject matter provided with a frangible closure which must be broken in order to send a signal.

SEE OR SEARCH THIS CLASS, SUBCLASS:

302, for this subject matter where the frangible closure encloses a movable key, which key is used to transmit the signal.