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3856513
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Patent number 3,856,513
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Issue date Dec 24, 1974
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B22 - CASTING POWDER METALLURGY
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3644863
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Patent number 3,644,863
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Issue date Feb 22, 1972
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C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...
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3427154
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Patent number 3,427,154
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Issue date Feb 11, 1969
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B22 - CASTING POWDER METALLURGY
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3297436
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Patent number 3,297,436
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Issue date Jan 10, 1967
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B22 - CASTING POWDER METALLURGY