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Threaded joint for steel pipes
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Patent number 8,857,857
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Issue date Oct 14, 2014
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Nippon Steel & Sumitomo Metal Corporation
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Kunio Goto
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C23 - COATING METALLIC MATERIAL COATING MATERIAL WITH METALLIC MATERIAL CHEMI...
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Threaded joint for steel tubes
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Patent number 8,276,946
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Issue date Oct 2, 2012
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Sumitomo Metal Industries, Ltd.
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Masanari Kimoto
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C23 - COATING METALLIC MATERIAL COATING MATERIAL WITH METALLIC MATERIAL CHEMI...
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Threaded joint for steel pipes
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Patent number 7,740,285
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Issue date Jun 22, 2010
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Sumitomo Metal Industries, Ltd.
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Shigeo Nagasaku
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C10 - PETROLEUM, GAS OR COKE INDUSTRIES TECHNICAL GASES CONTAINING CARBON MON...