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3620819
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Patent number 3,620,819
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Issue date Nov 16, 1971
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C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
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3453172
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Patent number 3,453,172
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Issue date Jul 1, 1969
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C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
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2522531
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Patent number 2,522,531
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Issue date Sep 19, 1950
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C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
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2017318
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Patent number 2,017,318
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Issue date Oct 15, 1935
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C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
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1980905
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Patent number 1,980,905
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Issue date Nov 13, 1934
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B28 - WORKING CEMENT, CLAY, OR STONE