US PATENT SUBCLASS 379 / 347
.~ With gain or attenuation control

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

338  DF  REPEATER (E.G., VOICE FREQUENCY) {9}
347.~ With gain or attenuation control

DEFINITION

Classification: 379/347

With gain or attenuation control:

(under subclass 338) Subject matter having circuitry to maintain or modify any increase or decrease in the magnitude of the signal.