US PATENT SUBCLASS 181 / 246
.~.~.~ Nonmetallic

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}
244  DF  .~.~ Corrosion prevention {2}
246.~.~.~ Nonmetallic

DEFINITION

Classification: 181/246

Nonmetallic:

(under subclass 244) Subject matter wherein the fluid conducting device is constructed of organic materials.