Wolfgang Krappen

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Wassenberg, DE

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Patents Grantslast 30 patents

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Method and apparatus for modifying the cross-sectional profile of a...
- Patent number 4,696,600
- Issue date Sep 29, 1987
- Wirth Maschinen-und Bohrgerate-Fabrik GmbH
- Georg Hurtz
- E21 - EARTH DRILLING MINING