Keiji Omura

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Kudamatsu, JP

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Patents Grantslast 30 patents

Information Patent Grant
Tube-hole structure for expanded tube-to-tube-sheet joint
- Patent number 4,142,581
- Issue date Mar 6, 1979
- Hitachi, Ltd.
- Yuji Yoshitomi
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...