US PATENT SUBCLASS 381 / FOR 158
.~.~ Including adjustment mechanism (381/198)

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381 /   HD   ELECTRICAL AUDIO SIGNAL PROCESSING SYSTEMS AND DEVICES

FOR 127  DF  HEARING AIDS, ELECTRICAL (381/68) {15}
FOR 152  DD  .~ Electromagnetic (e.g., dynamic) (381/192) {5}
FOR 158.~.~ Including adjustment mechanism (381/198)