US PATENT SUBCLASS 181 / 226
.~.~ With adjustable fluid flow

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}
226.~.~ With adjustable fluid flow

DEFINITION

Classification: 181/226

With adjustable fluid flow:

(under subclass 212) Subject matter wherein there is provided some means for varying the fluid flow while attenuating and diffusing the sounds normally produced by moving fluids.