US PATENT SUBCLASS 340 / 291
.~.~ Repeaters (e.g., from central to plural fire houses or to siren)

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}
291.~.~ Repeaters (e.g., from central to plural fire houses or to siren)

DEFINITION

Classification: 340/291

(under subclass 287) Subject matter having means for repeating signals one or more times or for repeating signals from one line or station to another line or station.

(1) Note. The signal may be repeated, for example, from the call box circuit into several circuits extending to separate fire houses.

SEE OR SEARCH CLASS

178, Telegraphy,

70+, for repeaters utilized in telegraphy.