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3738415
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Patent number 3,738,415
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Issue date Jun 12, 1973
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B22 - CASTING POWDER METALLURGY
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3362418
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Patent number 3,362,418
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Issue date Jan 9, 1968
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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3313067
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Patent number 3,313,067
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Issue date Apr 11, 1967
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B22 - CASTING POWDER METALLURGY
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3194416
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Patent number 3,194,416
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Issue date Jul 13, 1965
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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3103766
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Patent number 3,103,766
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Issue date Sep 17, 1963
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B22 - CASTING POWDER METALLURGY
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3097450
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Patent number 3,097,450
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Issue date Jul 16, 1963
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B22 - CASTING POWDER METALLURGY