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2945688
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Patent number 2,945,688
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Issue date Jul 19, 1960
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C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
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2539007
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Patent number 2,539,007
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Issue date Jan 23, 1951
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C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
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2174066
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Patent number 2,174,066
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Issue date Sep 26, 1939
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C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...
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2148052
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Patent number 2,148,052
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Issue date Feb 21, 1939
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C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
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2143905
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Patent number 2,143,905
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Issue date Jan 17, 1939
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C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
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2090363
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Patent number 2,090,363
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Issue date Aug 17, 1937
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C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES