US PATENT SUBCLASS 379 / 395
.~ Amplifying

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

387  DF  SUBSTATION OR TERMINAL CIRCUITRY {7}
395.~ Amplifying

DEFINITION

Classification: 379/395

Amplifying:

(under subclass 387) Subject matter for increasing the audio signal at a terminal.

SEE OR SEARCH CLASS

330, Amplifiers, appropriate subclasses for an amplifier.

381, Electrical Audio Signal Processing Systems and Devices,

120+, for audio systems with amplifiers.