US PATENT SUBCLASS 340 / 302
.~.~.~ Frangible guard or protector for key

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

DEFINITION

Classification: 340/302

(under subclass 301) Subject matter in which the key is

normally housed by a frangible closure, which must be broken in order to obtain the key for operation of the box.