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2948521
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Patent number 2,948,521
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Issue date Aug 9, 1960
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C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
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2890951
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Patent number 2,890,951
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Issue date Jun 16, 1959
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C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...