Nobuaki Hiraoka

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Amagasaki, JP

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Patents Grantslast 30 patents

Information Patent Grant
Process for manufacturing butt-welded steel pipe
- Patent number 4,139,139
- Issue date Feb 13, 1979
- Sumitomo Kinzoku Kogyo Kabushiki Kaisha
- Nobuaki Hiraoka
- B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR