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.