Masaharu Oku

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Mito, JP

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Patents Grantslast 30 patents

Information Patent Grant
Method and apparatus for producing a stepped hollow article
- Patent number 4,580,431
- Issue date Apr 8, 1986
- Hitachi, Ltd.
- Masaharu Oku
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
Information Patent Grant
Method of processing cylindrical surface
- Patent number 4,452,060
- Issue date Jun 5, 1984
- Hitachi, Ltd.
- Hisanobu Kanamaru
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...