US PATENT SUBCLASS 340 / 288
.~.~ Combined (e.g., alarm circuit over power line)

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}
288.~.~ Combined (e.g., alarm circuit over power line) {2}
289  DF  .~.~.~> With fire extinguisher (e.g., CO2)
290  DF  .~.~.~> Engine house apparatus controlling (e.g., releases horses, starts motor)

DEFINITION

Classification: 340/288

(under subclass 287) Subject matter combined with some other type of subject matter.

(1) Note. The signaling system, for example, may be combined with an electric light system whose conductors are used as the transmission medium for the signaling system.

SEE OR SEARCH CLASS

178, Telegraphy,

49, for telegraph systems combined with other types of electric systems.