US PATENT SUBCLASS 181 / 183
.~.~.~ Double wall

Current as of: June, 1999
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181 /   HD   ACOUSTICS

175  DF  SOUND-MODIFYING MEANS {12}
177  DF  .~ Intensifying horn {11}
182  DF  .~.~ With resonant chamber {1}
183.~.~.~ Double wall

DEFINITION

Classification: 181/183

(under subclass 182) Subject matter wherein the resonant chamber lies between at least part of a side of the horn and a second structure substantially parallel to that part of the horn.