US PATENT SUBCLASS 381 / FOR 146
.~.~ Enclosure or resonant cavity (381/159)

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381 /   HD   ELECTRICAL AUDIO SIGNAL PROCESSING SYSTEMS AND DEVICES

FOR 127  DF  HEARING AIDS, ELECTRICAL (381/68) {15}
FOR 140  DD  .~ With acoustic wave modifying structure (381/153) {5}
FOR 146.~.~ Enclosure or resonant cavity (381/159)