US PATENT SUBCLASS 379 / 255
.~.~.~ With interrupter

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

242  DF  CENTRALIZED SWITCHING SYSTEM {15}
251  DF  .~ With generating of call associated substation signal {3}
252  DF  .~.~ For alerting signal at called station (e.g., ringing) {3}
255.~.~.~ With interrupter

DEFINITION

Classification: 379/255

With interrupter:

(under subclass 252) Subject matter having timing equipment which periodically blocks the alerting signal.