US PATENT SUBCLASS 381 / 351
.~.~.~ Plural chambers

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}
337  DF  .~ Having acoustic wave modifying structure {5}
345  DF  .~.~ Acoustic enclosure {6}
351.~.~.~ Plural chambers

DEFINITION

Classification: 381/351

Plural chambers:

(under subclass 345) Subject matter wherein there is more than one physically distinct compartment space within the housing.