US PATENT SUBCLASS 181 / 151
.~ With sound-absorbing means

Current as of: June, 1999
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181 /   HD   ACOUSTICS

148  DF  DIAPHRAGM AND ENCLOSURE {8}
151.~ With sound-absorbing means

DEFINITION

Classification: 181/151

(under subclass 148) Subject matter including sound absorbent material within the means to enclose the diaphragm for preventing undesirable effects.

SEE OR SEARCH THIS CLASS, SUBCLASS:

146, for plural diaphragms and sound absorbing means.

199, for an enclosure with sound absorbing means.