US PATENT SUBCLASS 379 / 225
.~ Multi-PBX interconnection

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

219  DF  PLURAL EXCHANGE NETWORK OR INTERCONNECTION {6}
225.~ Multi-PBX interconnection

DEFINITION

Classification: 379/225

Multi-PBX interconnection:

(under subclass 219) Subject matter which connects a plurality of private branch exchanges by shared trunks therebetween.