US PATENT SUBCLASS 340 / 306
.~.~.~ Watchman's local circuit

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}
305  DF  .~.~ Local circuit to actuate box {1}
306.~.~.~ Watchman's local circuit

DEFINITION

Classification: 340/306

(under subclass 305) Subject matter in which the signal box is provided with a local circuit for use by watchmen.