US PATENT SUBCLASS 379 / 252
.~.~ For alerting signal at called station (e.g., ringing)

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.~.~ For alerting signal at called station (e.g., ringing) {3}
253  DF  .~.~.~> Electronic
254  DF  .~.~.~> Associated with connector
255  DF  .~.~.~> With interrupter

DEFINITION

Classification: 379/252

For alerting signal at called station (e.g., ringing):

(under subclass 251) Subject matter where the signal is a humanly perceptible signal at the called terminal.