Siegfried Grone

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Dortmund, DT

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Patents Grantslast 30 patents

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Method for manufacturing annular metal workpieces
- Patent number 4,084,419
- Issue date Apr 18, 1978
- Thyssen Industrie AG
- Erich Dittrich
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...