US PATENT SUBCLASS 381 / 170
.~.~ Compound

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

150  DF  ELECTRO-ACOUSTIC AUDIO TRANSDUCER {18}
369  DF  .~ Microphone capsule only {10}
170.~.~ Compound

DEFINITION

Classification: 381/170

Compound:

(under subclass 168) Subject matter having a plurality of independent microphone devices in a single casing.