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2889222
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Patent number 2,889,222
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Issue date Jun 2, 1959
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C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...
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2867555
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Patent number 2,867,555
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Issue date Jan 6, 1959
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C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...