US PATENT SUBCLASS 379 / 311
.~.~ Having signalling path feature

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

242  DF  CENTRALIZED SWITCHING SYSTEM {15}
310  DF  .~ Divided central (e.g., communication between switchboards) {1}
311.~.~ Having signalling path feature

DEFINITION

Classification: 379/311

Having signalling path feature:

(under subclass 310) Subject matter having signalling conductors connecting a plurality of the switchboards for signalling between any two switchboards.