US PATENT SUBCLASS 181 / 251
.~.~.~.~.~ And multi-passage

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}
247  DF  .~.~ Straight-through passage {4}
248  DF  .~.~.~ Continuous conduit {1}
249  DF  .~.~.~.~ With expansion chamber {2}
251.~.~.~.~.~ And multi-passage

DEFINITION

Classification: 181/251

And multipassage:

(under subclass 249) Subject matter having a plurality of through passages between which the moving fluid is divided.