US PATENT SUBCLASS 379 / 316
.~.~ Spring-jack cut-off

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

242  DF  CENTRALIZED SWITCHING SYSTEM {15}
315  DF  .~ With line-signal control {3}
316.~.~ Spring-jack cut-off

DEFINITION

Classification: 379/316

Spring-jack cut-off:

(under subclass 315) Subject matter wherein the switchboard has a jack containing resilient contact elements which contact elements are disconnected by insertion of plug into the jack and which insertion stops the operation of the indicating signal.