US PATENT SUBCLASS 379 / 250
.~ Four-wire switching

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

242  DF  CENTRALIZED SWITCHING SYSTEM {15}
250.~ Four-wire switching

DEFINITION

Classification: 379/250

Four-wire switching:

(under subclass 242) Subject matter for connecting two lines, each of which has a physically separate pair for each direction of transmission.