US PATENT SUBCLASS 181 / 132
.~.~.~ With diaphragm

Current as of: June, 1999
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181 /   HD   ACOUSTICS

126  DF  ANATOMIC OR PROSTHETIC RELATION {2}
128  DF  .~ Ear and mouth {4}
130  DF  .~.~ Auditory canal insert {5}
132.~.~.~ With diaphragm

DEFINITION

Classification: 181/132

(under subclass 130) Subject matter including a flexible element which form part of a sound sensing device.