Tadaaki Ayabe

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Ibaraki, JP

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Patents Grantslast 30 patents

Information Patent Grant
Tube-enlarging press for use in heat exchanger fabrication
- Patent number 4,597,171
- Issue date Jul 1, 1986
- Hitachi, Ltd.
- Yukio Kitayama
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
Information Patent Grant
Method of production of a part formed with an opening
- Patent number 4,583,675
- Issue date Apr 22, 1986
- Hitachi, Ltd.
- Izumi Ochiai
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...