US PATENT SUBCLASS 379 / 207
.~ At plural exchanges

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

201  DF  SPECIAL SERVICES {9}
207.~ At plural exchanges

DEFINITION

Classification: 379/207

At plural exchanges:

(under subclass 201) Subject matter providing a modification of normal telephone call signalling or connection between different exchanges.

SEE OR SEARCH THIS CLASS, SUBCLASS:

219+, for plural exchange networks or signalling.