US PATENT SUBCLASS 340 / 538
.~.~.~ Combined with power line

Current as of: June, 1999
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340 /   HD   COMMUNICATIONS: ELECTRICAL

500  DF  CONDITION RESPONSIVE INDICATING SYSTEM {6}
531  DF  .~ With particular coupling link {3}
533  DF  .~.~ Wired {4}
538.~.~.~ Combined with power line

DEFINITION

Classification: 340/538

Combined with power line:

(under subclass 533) Subject matter where the wired communication link is a wired electrical power transmission system.

(1) Note. The system need not be the power source of the indicating system.

SEE OR SEARCH THIS CLASS, SUBCLASS:

310.01+, for transmitting a manually initiated alarm signal over a power line.