US PATENT SUBCLASS 379 / 186
.~ Central power source

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

177  DF  POLYSTATION LINE SYSTEM (I.E., PARTY LINE) {6}
186.~ Central power source

DEFINITION

Classification: 379/186

Central power source:

(under subclass 177) Subject matter having a common electrical energizing supply for the stations connected to a line.