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3861451
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Patent number 3,861,451
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Issue date Jan 21, 1975
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B22 - CASTING POWDER METALLURGY
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3799238
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Patent number 3,799,238
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Issue date Mar 26, 1974
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B22 - CASTING POWDER METALLURGY
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3795270
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Patent number 3,795,270
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B22 - CASTING POWDER METALLURGY
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3726332
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Patent number 3,726,332
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Issue date Apr 10, 1973
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B22 - CASTING POWDER METALLURGY
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3587716
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B22 - CASTING POWDER METALLURGY
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3262161
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Patent number 3,262,161
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Issue date Jul 26, 1966
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B22 - CASTING POWDER METALLURGY