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Spinel type fused refractory product
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Patent number 4,348,485
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Issue date Sep 7, 1982
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Asahi Glass Company, Ltd.
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Koji Oohasi
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C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
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3763302
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Patent number 3,763,302
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Issue date Oct 2, 1973
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B28 - WORKING CEMENT, CLAY, OR STONE
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3487136
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Patent number 3,487,136
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Issue date Dec 30, 1969
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C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES