US PATENT SUBCLASS 340 / 292
.~.~ Circuit maintenance (e.g., fault alarm, faulty circuit substitution)

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}
292.~.~ Circuit maintenance (e.g., fault alarm, faulty circuit substitution)

DEFINITION

Classification: 340/292

(under subclass 287) Subject matter provided with means for maintaining the circuit in operable condition so as to permit sending signals at all times in spite of one or more breaks in the wires and signal box systems provided with means for giving an alarm when an abnormal condition in a circuit, which would prevent normal use, develops.

SEE OR SEARCH CLASS

178, Telegraphy,

69, for line clearance and circuit maintenance systems utilized in telegraphy.