US PATENT SUBCLASS 381 / FOR 147
.~ Microphone (381/168)

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.~ Microphone (381/168) {2}
FOR 148  DD  .~.~> With mounting or support feature (381/169)
FOR 149  DD  .~.~> Headphone (381/183)