73059339
Aug 1, 1975
Nov 23, 1976
SAINT-GOBAIN CERAMICS & PLASTICS INC.
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CERAMIC DIFFUSANTS IN WAFER FORM, USED IN MANUFACTURING PROCESSES FOR SEMI-CONDUCTORS AND THE LIKE; BORON NITRIDE IN SOLID FORM, IN POWDER FORM AND AS A COATING MATERIAL IN LIQUID FORM