72461902
Jul 2, 1973
Nov 18, 1975
SAINT-GOBAIN/NORTON INDUSTRIAL CERAMICSCORPORATION
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POLYCRYSTALLINE OPTICAL PRODUCTS-NAMELY, LENSES, WINDOWS, PRISMS, BLANKS AND BEAM SPLITTERS THAT ARE TRANSPARENT TO LIGHT IN THE INFRA-RED, ULTRA-VIOLET OR VISIBLE RANGE