US PATENT SUBCLASS 181 / 236
.~.~ With muffler cut-out

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}
236.~.~ With muffler cut-out

DEFINITION

Classification: 181/236

With muffler cut-out:

(under subclass 212) Subject matter comprising a valve device which can be utilized for diverting the moving fluid away from the fluid conducting attenuating device which performs the muffling operation.