US PATENT SUBCLASS 381 / 352
.~.~.~ Having internal wave reflecting means

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}
352.~.~.~ Having internal wave reflecting means

DEFINITION

Classification: 381/352

Having internal wave reflecting means:

(under subclass 345) Subject matter wherein the cavity or housing contains means to redirect a direction of travel of a sound wave.