US PATENT SUBCLASS 181 / 267
.~.~.~ Coaxial foraminous walls


Current as of: June, 1999
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181 /   HD   ACOUSTICS

175  DF  SOUND-MODIFYING MEANS {12}
212  DF  .~ Muffler, fluid conducting type {25}
264  DF  .~.~ With baffle or baffle structure {9}
267.~.~.~ Coaxial foraminous walls


DEFINITION

Classification: 181/267

Coaxial foraminous walls:

(under subclass 264) Subject matter in which are provided a plurality of coaxial cylindrical chambers having fluid pervious walls through which the fluid flows in a radial direction into the atmosphere.