Hans Nilberg

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Apple Valley, CA, US

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Patents Grantslast 30 patents

Information Patent Grant
Construction of a concrete lined chamber
- Patent number 4,431,341
- Issue date Feb 14, 1984
- Santa Fe International Corporation
- Hans Nilberg
- E21 - EARTH DRILLING MINING
Information Patent Grant
Concrete lining of drilled shaft
- Patent number 4,423,981
- Issue date Jan 3, 1984
- Santa Fe International Corporation
- Hans Nilberg
- E21 - EARTH DRILLING MINING