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3785802
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C21 - METALLURGY OF IRON
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B22 - CASTING POWDER METALLURGY
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Patent number 3,694,187
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B22 - CASTING POWDER METALLURGY
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Issue date Sep 19, 1967
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C21 - METALLURGY OF IRON
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C21 - METALLURGY OF IRON
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C21 - METALLURGY OF IRON