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3790334
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Patent number 3,790,334
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Issue date Feb 5, 1974
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C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
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3765826
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Patent number 3,765,826
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Issue date Oct 16, 1973
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C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
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3619435
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Patent number 3,619,435
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Issue date Nov 9, 1971
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C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
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3118658
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Patent number 3,118,658
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Issue date Jan 21, 1964
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C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES