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3638400
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Patent number 3,638,400
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Issue date Feb 1, 1972
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C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
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3503187
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Patent number 3,503,187
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Issue date Mar 31, 1970
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C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
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3365521
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Patent number 3,365,521
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Issue date Jan 23, 1968
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C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
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2293992
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Patent number 2,293,992
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Issue date Aug 25, 1942
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F27 - FURNACES KILNS OVENS RETORTS