US PATENT SUBCLASS 379 / 393
.~ Hold circuit


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

387  DF  SUBSTATION OR TERMINAL CIRCUITRY {7}
393.~ Hold circuit


DEFINITION

Classification: 379/393

Hold circuit:

(under subclass 387) Subject matter for maintaining a subscriber loop circuit in an active but noncommunicating mode.

SEE OR SEARCH THIS CLASS, SUBCLASS:

162+, for a key system hold circuit.