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3613771
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Patent number 3,613,771
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Issue date Oct 19, 1971
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B22 - CASTING POWDER METALLURGY
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3603377
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Patent number 3,603,377
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Issue date Sep 7, 1971
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B22 - CASTING POWDER METALLURGY
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3556198
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Patent number 3,556,198
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Issue date Jan 19, 1971
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B22 - CASTING POWDER METALLURGY
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3480074
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Patent number 3,480,074
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Issue date Nov 25, 1969
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B22 - CASTING POWDER METALLURGY
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3448908
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Patent number 3,448,908
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Issue date Jun 10, 1969
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B22 - CASTING POWDER METALLURGY