US PATENT SUBCLASS 181 / 221
.~.~.~.~ Liquid

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}
213  DF  .~.~ Reaction engine type {7}
220  DF  .~.~.~ With disparate fluid mingling {1}
221.~.~.~.~ Liquid

DEFINITION

Classification: 181/221

Liquid:

(under subclass 200) Subject matter in which the added fluid is a liquid, usually water.