US2116954A
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Mechanically working metal article
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US2105015A
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Mechanically working metal article
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US2110965A
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Reducing the diameter of hollow metal articles
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US2102099A
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Enlarging the diameter of hollow metal articles
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US2023776A
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Production of seamless tubes and other elongate articles
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US1984603A
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Extrusion press
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US2036182A
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Extrusion method
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US2006080A
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Extrusion press
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US1966953A
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Extrusion press
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US1989948A
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Extrusion apparatus
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US1982544A
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Method and apparatus for elongating metal articles
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US1960832A
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Method of producing wrought iron
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US1955243A
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Method of producing seamless tubes by extrusion
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CA377038A
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Metal article working method
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