72420801
Apr 10, 1972
Jan 8, 1974
FIRE CLAY; FOUNDRY MOLD-COATING MATERIAL; AND HYDRAULIC-SETTING CASTABLE CLAYS FOR FOUNDRY USE
ChemicalsREFRACTORY MATERIALS-NAMELY, REFRACTORY MORTAR; MIXTURES OF FIRE CLAY AND BRICK GROG; CARBONACEOUS MAINTENANCE GUNNING AND RAMMING MATERIAL; AND SEALER-COATER FOR REFRACTORY FURNACE LININGS
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