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3447590
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B22 - CASTING POWDER METALLURGY
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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Patent number 2,183,010
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Issue date Dec 12, 1939
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B22 - CASTING POWDER METALLURGY
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2108752
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Patent number 2,108,752
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Issue date Feb 15, 1938
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B22 - CASTING POWDER METALLURGY
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2108753
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Patent number 2,108,753
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Issue date Feb 15, 1938
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B22 - CASTING POWDER METALLURGY