US PATENT SUBCLASS 181 / 161
.~ With direct mechanical connection to drive unit

Current as of: June, 1999
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181 /   HD   ACOUSTICS

157  DF  DIAPHRAGM {10}
161.~ With direct mechanical connection to drive unit {1}
162  DF  .~.~> Stylus bar

DEFINITION

Classification: 181/161

(under subclass 157) Subject matter including a mechanical means which directly connects the diaphragm to a driver unit.