US PATENT SUBCLASS 379 / 162
.~ Detail of hold circuitry

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

156  DF  MULTI-LINE OR KEY SUBSTATION SYSTEM WITH SELECTIVE SWITCHING AND CENTRAL SWITCHING OFFICE CONNECTION {7}
162.~ Detail of hold circuitry {1}
163  DF  .~.~> Electronic

DEFINITION

Classification: 379/162

Detail of hold circuitry:

(under subclass 156) Subject matter including details of circuitry to allow an established telephone connection be maintained without the transmission or reception of audio signals.

SEE OR SEARCH THIS CLASS, SUBCLASS:

84, for dynamic reproduction of a recorded audio signal combined with line holding.

393, for line holding other than in a key system.