US PATENT SUBCLASS 340 / 308
.~.~.~ Controlled by door of signal box

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}
307  DF  .~.~ Transmitters {2}
308.~.~.~ Controlled by door of signal box

DEFINITION

Classification: 340/308

(under subclass 307) Subject matter in which the signal is sent automatically when the door of the signal box is opened.