Hiromi Seki

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Kitakyushu, JP

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Patents Grantslast 30 patents

Information Patent Grant
Method of manufacturing metal pipe with longitudinally differentiat...
- Patent number 4,603,806
- Issue date Aug 5, 1986
- Nippon Steel Corporation
- Kazuo Watanabe
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...