US PATENT SUBCLASS 381 / 171
.~.~ Micromagnetic

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}
171.~.~ Micromagnetic

DEFINITION

Classification: 381/171

Micromagnetic:

(under subclass 168) Subject matter in which the incident sound vibrates a diaphragm so as to vary both the resistance of a microphone contact and magnetic induction means which reinforce each other to produce a combined affect on an electric current.