US PATENT SUBCLASS 379 / 222
.~ Toll center

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

219  DF  PLURAL EXCHANGE NETWORK OR INTERCONNECTION {6}
222.~ Toll center {1}
223  DF  .~.~> With operator assistance

DEFINITION

Classification: 379/222

Toll center:

(under subclass 219) Subject matter including a switching center for switching toll calls from other exchanges.