US PATENT SUBCLASS 51 / 308
.~ Clay, silica, or silicate

Current as of: June, 1999
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51 /   HD   ABRASIVE TOOL MAKING PROCESS, MATERIAL, OR COMPOSITION

307  DF  WITH INORGANIC MATERIAL {2}
308.~ Clay, silica, or silicate

DEFINITION

Classification: 51/308

Clay, silica, or silicate:

(under subclass 307) Subject matter in which the inorganic material comprises clay, silica, or a silicate.