US PATENT SUBCLASS 181 / 174
.~.~ Variable thickness

Current as of: June, 1999
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181 /   HD   ACOUSTICS

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

DEFINITION

Classification: 181/174

(under subclass 173) Subject matter wherein the thickness of the vibratable partition constituting the diaphragm varies across its surface.