US PATENT SUBCLASS 381 / FOR 149
.~.~ Headphone (381/183)

Current as of: June, 1999
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381 /   HD   ELECTRICAL AUDIO SIGNAL PROCESSING SYSTEMS AND DEVICES

FOR 127  DF  HEARING AIDS, ELECTRICAL (381/68) {15}
FOR 147  DD  .~ Microphone (381/168) {2}
FOR 149.~.~ Headphone (381/183)