US PATENT SUBCLASS 181 / 279
.~.~.~ Spiral

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}
279.~.~.~ Spiral {1}
280  DF  .~.~.~.~> Helical

DEFINITION

Classification: 181/279

Spiral:

(under subclass 264) Subject matter in which the baffles are arranged to guide the moving fluid through an axially or radially expanding, circular path.