US PATENT SUBCLASS 181 / 152
.~ With horn

Current as of: June, 1999
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181 /   HD   ACOUSTICS

148  DF  DIAPHRAGM AND ENCLOSURE {8}
152.~ With horn

DEFINITION

Classification: 181/152

(under subclass 148) Subject matter including a tube of varying sectional area associated with the diaphragm for intensifying the sound waves produced therefrom.