US PATENT SUBCLASS 379 / 77
.~.~.~.~ Control by generated tone

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

67.1  DF  AUDIO MESSAGE STORAGE, RETRIEVAL, OR SYNTHESIS {13}
68  DF  .~ Dynamic audio signal recording or reproduction {4}
70  DF  .~.~ Call intercept or answering {7}
74  DF  .~.~.~ Remote control over telephone line {3}
77.~.~.~.~ Control by generated tone

DEFINITION

Classification: 379/77

Control by generated tone:

(under subclass 74) Subject matter wherein the specified signal has an audio frequency component.

(1) Note. Included herein is control by push button telephone devices.