DIFF Subgroup
C03C 3/06 with more than 90% silica by weight, e.g. quartz
Introduced: September 1968
Full Title
Glass compositions > containing silica > with more than 90% silica by weight, e.g. quartz
Of 1 combined children, 0 exist in both systems.
1 codes are CPC-only extensions.
Child Classifications
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