US PATENT SUBCLASS 181 / 257
.~.~.~ 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}
256  DF  .~.~ With sound absorbing material {2}
257.~.~.~ And multi-passage

DEFINITION

Classification: 181/257

And multipassage:

(under subclass 256) Subject matter having a plurality of passages between which the moving fluid is divided.