US PATENT SUBCLASS 181 / 225
.~.~ With fan to assist fluid 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}
225.~.~ With fan to assist fluid flow

DEFINITION

Classification: 181/225

With fan to assist fluid flow:

(under subclass 212) Subject matter wherein there is provided rotating fan means to assist in the movement of fluid through the sound modifying means.

(1) Note. The fan of this subclass type may be operated by the force of the moving fluid or may be operated by some other mechanical means.