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Method of producing cement
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Patent number 4,289,537
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Issue date Sep 15, 1981
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Lectromelt Corporation
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Howard F. Davis
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C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
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1332422
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Patent number 1,332,422
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Issue date Mar 2, 1920
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C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
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939217
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Patent number 939,217
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Issue date Nov 9, 1909
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C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
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897938
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Patent number 897,938
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Issue date Sep 8, 1908
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C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
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876602
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Patent number 876,602
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Issue date Jan 14, 1908
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C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES