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3329746
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Patent number 3,329,746
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Issue date Jul 4, 1967
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B22 - CASTING POWDER METALLURGY
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2356599
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Patent number 2,356,599
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Issue date Aug 22, 1944
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B22 - CASTING POWDER METALLURGY
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2271264
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Patent number 2,271,264
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Issue date Jan 27, 1942
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B22 - CASTING POWDER METALLURGY
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2040168
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Patent number 2,040,168
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Issue date May 12, 1936
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B22 - CASTING POWDER METALLURGY