US PATENT SUBCLASS 379 / 375
.~.~.~ With electronic call sounder (e.g., tone "ringer")


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

350  DF  SUPERVISORY OR CONTROL LINE SIGNALLING {5}
372  DF  .~ Signal reception at substation {1}
373  DF  .~.~ Incoming call alerting (e.g., ringing) {3}
375.~.~.~ With electronic call sounder (e.g., tone "ringer")


DEFINITION

Classification: 379/375

With electronic call sounder (e.g., tone "ringer"):

(under subclass 373) Subject matter where an audible alerting signal is generated at a subscriber terminal by a circuit having at least one electronic device.