Seiki Hiraoka

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Itami, JP

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Patents Grantslast 30 patents

Information Patent Grant
Super hard metal roll assembly and production thereof
- Patent number 4,137,106
- Issue date Jan 30, 1979
- Sumitomo Electric Industries, Ltd.
- Yoshihiko Doi
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...