Erwin Bollian

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Rastatt, DT

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Patents Grantslast 30 patents

Information Patent Grant
Method of and apparatus for manufacturing double contact rivets
- Patent number 4,073,425
- Issue date Feb 14, 1978
- Doduco; Eugen Durrwachter
- Erwin Bollian
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...