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3048903
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Patent number 3,048,903
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Issue date Aug 14, 1962
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B22 - CASTING POWDER METALLURGY
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2920361
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Patent number 2,920,361
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Issue date Jan 12, 1960
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B22 - CASTING POWDER METALLURGY
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2649630
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Patent number 2,649,630
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Issue date Aug 25, 1953
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B22 - CASTING POWDER METALLURGY
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2610373
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Patent number 2,610,373
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B22 - CASTING POWDER METALLURGY
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1929777
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Patent number 1,929,777
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Issue date Oct 10, 1933
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B22 - CASTING POWDER METALLURGY
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1332938
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Patent number 1,332,938
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Issue date Mar 9, 1920
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B22 - CASTING POWDER METALLURGY