US PATENT SUBCLASS 381 / 335
.~.~ Plural diaphragms, compartments, or housings

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

87  DF  HAVING NON-ELECTRICAL FEATURE (E.G., MOUNTING) {3}
332  DF  .~ And loudspeaker {4}
335.~.~ Plural diaphragms, compartments, or housings

DEFINITION

Classification: 381/335

Plural diaphragms, compartments, or housings:

(under subclass 332) Subject matter in which there is a) more than one movable membrane within an enclosure, or b) an enclosure having more than one distinct volume, or c) more than one enclosure.