US PATENT SUBCLASS 379 / 315
.~ With line-signal control

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

242  DF  CENTRALIZED SWITCHING SYSTEM {15}
315.~ With line-signal control {3}
316  DF  .~.~> Spring-jack cut-off
317  DF  .~.~> Relay cut-off
318  DF  .~.~> Central power source

DEFINITION

Classification: 379/315

With line-signal control:

(under subclass 242) Subject matter having a switchboard with a line condition responsive indicator and controlled in response to an operator's action on the call connection.

SEE OR SEARCH THIS CLASS, SUBCLASS:

350+, for telephone line signalling.