US PATENT SUBCLASS 379 / 317
.~.~ Relay 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}
317.~.~ Relay cut-off

DEFINITION

Classification: 379/317

Relay cut-off:

(under subclass 315) Subject matter wherein the line signal operation is stopped by a relay in response to insertion of a plug into a switchboard jack.