US PATENT SUBCLASS 379 / 169
.~.~ Central power source

Current as of: June, 1999
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379 /   HD   TELEPHONIC COMMUNICATIONS

167  DF  PRIVATE (E.G., HOUSE OR INTERCOM) OR SINGLE LINE SYSTEM {6}
168  DF  .~ Lockout {1}
169.~.~ Central power source

DEFINITION

Classification: 379/169

Central power source:

(under subclass 168) Subject matter having a single energy source for the entire system.