US PATENT SUBCLASS 381 / FOR 161
.~.~.~ Magnetic configuration (e.g., tubular or U-shaped) (381/201)


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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 159  DD  .~.~ Magnetic circuit or core structure (381/199) {2}
FOR 161.~.~.~ Magnetic configuration (e.g., tubular or U-shaped) (381/201)