Klaus Knapper

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Hamm, DE

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Patents Grantslast 30 patents

Information Patent Grant
Method of fabricating box section from steel with walls that differ...
- Patent number 5,040,399
- Issue date Aug 20, 1991
- Hoesch AG
- Klaus Knapper
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...