US PATENT SUBCLASS 181 / 244
.~.~ Corrosion prevention

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.~.~ Corrosion prevention {2}
245  DF  .~.~.~> Internally coated parts
246  DF  .~.~.~> Nonmetallic

DEFINITION

Classification: 181/244

Corrosion prevention:

(under subclass 212) Subject matter comprising means for preventing chemical erosion of the material of which the device is made.