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Helmar Nafe
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Essen, DE
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last 30 patents
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Patent Grant
Method and apparatus for improving the crushing action of demolitio...
Patent number
5,273,217
Issue date
Dec 28, 1993
Krupp Maschinentechnik Gesellschaft mit beschrankter Haftung
Robert-Jan Bartels
E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
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Patent Grant
Dual-force hydraulic drive for a demolition tool
Patent number
5,199,658
Issue date
Apr 6, 1993
Krupp Maschinentechnik Gesellschaft mit beschrankter Haftung
Robert-Jan Bartels
E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING