US PATENT SUBCLASS 381 / FOR 141
.~.~ Including sound conducting tube (381/154)
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June, 1999
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381 /
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ELECTRICAL AUDIO SIGNAL PROCESSING SYSTEMS AND DEVICES
FOR 127
DF
HEARING AIDS, ELECTRICAL (381/68)
{15}
FOR 140
DD
.~ With acoustic wave modifying structure (381/153) {5}
FOR 141
.~.~ Including sound conducting tube (381/154)