US PATENT SUBCLASS 379 / 202
.~ Conferencing

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

201  DF  SPECIAL SERVICES {9}
202.~ Conferencing {3}
203  DF  .~.~> Operator control
204  DF  .~.~> Subscriber control {1}
206  DF  .~.~> At substation

DEFINITION

Classification: 379/202

Conferencing:

(under subclass 201) Subject matter which enables three or more terminals on distinct subscriber lines to be included in a single call connection.

SEE OR SEARCH THIS CLASS, SUBCLASS:

158, for conferencing involving a key-type substation system.