US PATENT SUBCLASS 381 / 429
.~.~.~ Apertures in surface

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}
396  DF  .~ Electromagnetic (e.g., dyynamic) {8}
423  DF  .~.~ Specified diaphragm shape or structure {6}
429.~.~.~ Apertures in surface

DEFINITION

Classification: 381/429

Apertures in surface

(under subclass 423) Subject matter in which a diaphragm is perforated or has holes or openings therein.