US PATENT SUBCLASS 379 / 159
.~ With intercom system

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}
159.~ With intercom system {1}
160  DF  .~.~> With connection of intercom station to subscriber line

DEFINITION

Classification: 379/159

With intercom system:

(under subclass 156) Subject matter having a line which is not normally connected to the public telephone system.

(1) Note. These lines are often connected between terminals on the key-type system.

SEE OR SEARCH THIS CLASS, SUBCLASS:

167, for an intercom system, per se.