73778851
Feb 2, 1989
Oct 8, 1991
ZIRCON, ZIRCON MINERALS, ZIRCON CONTAINING MATERIALS INCLUSIVE OF MINERAL SANDS CONTAINING ZIRCON AND ORES CONTAINING ZIRCON FOR ULTIMATE USE IN FOUNDRIES AND AS A REFRACTORY OR HEAT RESISTANT LINING IN FURNACES AS WELL AS IN CERAMICS AND IN CASTING APPLICATIONS
Chemicals