US PATENT SUBCLASS 381 / FOR 152
.~ Electromagnetic (e.g., dynamic) (381/192)


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381 /   HD   ELECTRICAL AUDIO SIGNAL PROCESSING SYSTEMS AND DEVICES

FOR 127  DF  HEARING AIDS, ELECTRICAL (381/68) {15}
FOR 152.~ Electromagnetic (e.g., dynamic) (381/192) {5}
FOR 153  DD  .~.~> Having feature of edge-supported diaphragm (381/193)
FOR 154  DD  .~.~> Movable voice coil (381/194) {3}
FOR 158  DD  .~.~> Including adjustment mechanism (381/198)
FOR 159  DD  .~.~> Magnetic circuit or core structure (381/199) {2}
FOR 162  DD  .~.~> Specified diaphragm shape or structure (381/202) {2}