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3514282
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Patent number 3,514,282
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Issue date May 26, 1970
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C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...
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1557879
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Patent number 1,557,879
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Issue date Oct 20, 1925
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C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...