US PATENT SUBCLASS 379 / 158
.~.~ Conferencing

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  DF  .~ With special service {1}
158.~.~ Conferencing

DEFINITION

Classification: 379/158

Conferencing:

(under subclass 157) Subject matter enabling three or more terminals to be included in a single call connection.

SEE OR SEARCH THIS CLASS, SUBCLASS:

202+, for conferencing not limited to a key telephone system.