US PATENT SUBCLASS 340 / 301
.~.~ Portable box actuating key (e.g., key must be released by signal from central)

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}
301.~.~ Portable box actuating key (e.g., key must be released by signal from central) {1}
302  DF  .~.~.~> Frangible guard or protector for key

DEFINITION

Classification: 340/301

(under subclass 287) Subject matter in which the signal box in actuated by a movable key.

(1) Note. The key may, for example, be attached to the box by means of a chain, or the key may be in the custody of the person who turns in the alarm, who must surrender the key to box mechanism before he can turn the alarm in, so that his identity may be made known.