US PATENT SUBCLASS 181 / 274
.~.~.~.~ With centrifugal 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}
264  DF  .~.~ With baffle or baffle structure {9}
269  DF  .~.~.~ Expansion chamber type {6}
274.~.~.~.~ With centrifugal flow

DEFINITION

Classification: 181/274

With centrifugal flow:

(under subclass 269) Subject matter in which the inlet to the expansion chamber and the baffles are in such direction as to impel the fluid into a circular flow.