US PATENT SUBCLASS 251 / 368
.~ Materials

Current as of: June, 1999
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251 /   HD   VALVES AND VALVE ACTUATION

356  DF  VALVE {5}
368.~ Materials

DEFINITION

Classification: 251/368

(under subclass 356) Devices relating to the materials of which valve parts are made.

SEE OR SEARCH CLASS

137, Fluid Handling,

375, for coatings or linings of particular materials.