US PATENT SUBCLASS 181 / 160
.~ With resonant chamber

Current as of: June, 1999
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181 /   HD   ACOUSTICS

157  DF  DIAPHRAGM {10}
160.~ With resonant chamber

DEFINITION

Classification: 181/160

(under subclass 157) Subject matter including a compartment which is acoustically coupled to the diaphragm.

(1) Note. The compartment will affect the quality, tone or loudness of the sound produced by the diaphragm.