US PATENT SUBCLASS 381 / FOR 150
.~ Having body supported structure (e.g., earphone) (381/187)


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381 /   HD   ELECTRICAL AUDIO SIGNAL PROCESSING SYSTEMS AND DEVICES

FOR 127  DF  HEARING AIDS, ELECTRICAL (381/68) {15}
FOR 150.~ Having body supported structure (e.g., earphone) (381/187)