71633766
Aug 12, 1952
Apr 6, 1954
GRAPHITE BLOCKS OR BRICKS WHICH ARE IMPREGNATED OR COATED WITH INORGANIC, OXIDATION-RESISTANT COMPOUNDS, SAID BLOCKS OR BRICKS BEING USEFUL IN THE CONSTRUCTION OF MOLDS OR CASTING BEDS IN THE CASTING OF HOT OR MOLTEN METALS AND REFRACTORY COMPOSITIONS
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