US PATENT SUBCLASS 379 / 232
.~.~.~ PBX trunk groups


Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use



379 /   HD   TELEPHONIC COMMUNICATIONS

219  DF  PLURAL EXCHANGE NETWORK OR INTERCONNECTION {6}
229  DF  .~ Interexchange signalling {6}
231  DF  .~.~ Central office-to-PBX signalling {2}
232.~.~.~ PBX trunk groups


DEFINITION

Classification: 379/232

PBX trunk groups:

(under subclass 231) Subject matter including a plurality of shared trunk lines connecting the central office and the private branch exchange.