US PATENT SUBCLASS 379 / 178
.~ Revertive call

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

177  DF  POLYSTATION LINE SYSTEM (I.E., PARTY LINE) {6}
178.~ Revertive call

DEFINITION

Classification: 379/178

Revertive call:

(under subclass 177) Subject matter which enables calling another party on the same line.