US PATENT SUBCLASS 381 / 120
WITH AMPLIFIER

Current as of: June, 1999
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381 /   HD   ELECTRICAL AUDIO SIGNAL PROCESSING SYSTEMS AND DEVICES

120WITH AMPLIFIER {1}
121  DF  .~> Feedback

DEFINITION

Classification: 381/120

WITH AMPLIFIER:

(under the class definition) Subject matter including a device for producing an output of greater amplitude than is applied at an input.

SEE OR SEARCH CLASS

330, Amplifiers, appropriate subclasses for amplifiers not having specific input signals or specific loads.

379, Telephonic Communications,

395, for amplifiers combined with telephone systems.