US PATENT SUBCLASS 381 / 186
.~.~ Plural diaphragms

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}
182  DF  .~ Plural or compound reproducers {4}
186.~.~ Plural diaphragms

DEFINITION

Classification: 381/186

Plural diaphragms:

(under subclass 182) Subject matter including a speaker having plural flexible membranes, for radiating sound waves.