US PATENT SUBCLASS 381 / 112
.~ With carbon microphone

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

111  DF  CIRCUITRY COMBINED WITH SPECIFIC TYPE MICROPHONE OR LOUDSPEAKER {6}
112.~ With carbon microphone

DEFINITION

Classification: 381/112

With carbon microphone:

(under subclass 111) Subject matter where the transducer is a carbon microphone.

SEE OR SEARCH THIS CLASS, SUBCLASS:

180+, for a carbon microphone, per se.