US PATENT SUBCLASS 181 / 173
.~ Particular shape

Current as of: June, 1999
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181 /   HD   ACOUSTICS

157  DF  DIAPHRAGM {10}
173.~ Particular shape {1}
174  DF  .~.~> Variable thickness

DEFINITION

Classification: 181/173

(under subclass 157) Subject matter characterized by the form or configuration of the diaphragm.