Jan Piet t. Sijthoff

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Amstelveen, NL

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Patents Grantslast 30 patents

Information Patent Grant
Method and apparatus for breaking up lumps of stone from a subaqueo...
- Patent number 4,150,502
- Issue date Apr 24, 1979
- Ballast-Nedam Groep N.V.
- Jan Piet t. Sijthoff
- E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING