US PATENT SUBCLASS 379 / 157
.~ With special service

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

156  DF  MULTI-LINE OR KEY SUBSTATION SYSTEM WITH SELECTIVE SWITCHING AND CENTRAL SWITCHING OFFICE CONNECTION {7}
157.~ With special service {1}
158  DF  .~.~> Conferencing

DEFINITION

Classification: 379/157

With special service:

(under subclass 156) Subject matter providing for an additional service beyond normal telephone call signalling or connection (i.e., those not normally provided without additional fees).

(1) Note. Such services generally involve three or more stations or two or more call connections.

SEE OR SEARCH THIS CLASS, SUBCLASS:

201+, for centralized switching with special services.