US PATENT SUBCLASS 181 / 153
.~ Rounded enclosure (e.g., curved, etc.)

Current as of: June, 1999
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181 /   HD   ACOUSTICS

148  DF  DIAPHRAGM AND ENCLOSURE {8}
153.~ Rounded enclosure (e.g., curved, etc.)

DEFINITION

Classification: 181/153

(under subclass 148) Subject matter wherein the means to enclose the diaphragm has at least one surface that is circular or curved.