US PATENT SUBCLASS 379 / 198
.~.~ PBX

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

188  DF  CALL OR TERMINAL ACCESS ALARM OR CONTROL {5}
196  DF  .~ At switching center {2}
198.~.~ PBX

DEFINITION

Classification: 379/198

PBX:

(under subclass 196) Subject matter wherein the switching center is a private branch exchange.