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3378061
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Patent number 3,378,061
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Issue date Apr 16, 1968
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B22 - CASTING POWDER METALLURGY
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3375862
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Patent number 3,375,862
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Issue date Apr 2, 1968
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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2825104
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Patent number 2,825,104
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Issue date Mar 4, 1958
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B22 - CASTING POWDER METALLURGY
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2743492
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Patent number 2,743,492
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Issue date May 1, 1956
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B22 - CASTING POWDER METALLURGY