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3411924
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Patent number 3,411,924
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Issue date Nov 19, 1968
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C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
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1898358
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Patent number 1,898,358
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Issue date Feb 21, 1933
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C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
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1409939
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Patent number 1,409,939
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Issue date Mar 21, 1922
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C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
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1376523
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Patent number 1,376,523
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Issue date May 3, 1921
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C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES