US PATENT SUBCLASS 379 / 224
.~ Tandem switching center

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

219  DF  PLURAL EXCHANGE NETWORK OR INTERCONNECTION {6}
224.~ Tandem switching center

DEFINITION

Classification: 379/224

Tandem switching center:

(under subclass 219) Subject matter having a switching center or office located intermediate between an originating and receiving switching office for switching the trunks connected

to such offices.