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Process for straightening a tube
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Patent number 7,654,122
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Issue date Feb 2, 2010
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Sumitomo Metal Industries, Ltd.
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Satoshi Tsuyuguchi
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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Tube rolling method and apparatus
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Patent number 5,533,370
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Issue date Jul 9, 1996
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Sumitomo Metal Industries, Ltd.
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Kouichi Kuroda
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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Method of manufacturing a finned tube
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Patent number 4,901,553
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Issue date Feb 20, 1990
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Sumitomo Metal Industries, Ltd.
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Kouichi Kuroda
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...