Jacobus M. Donkers

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Zaandam, NL

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Patents Grantslast 30 patents

Information Patent Grant
Dredging apparatus with spring-supported bucket ladder
- Patent number 4,133,120
- Issue date Jan 9, 1979
- N.V. Industrieele Handelscombinatie Holland
- Jacobus M. Donkers
- E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
Information Patent Grant
Bucket dredger
- Patent number 4,000,568
- Issue date Jan 4, 1977
- N.V. Industrieele Handelscombinatie Holland
- Jacobus M. Donkers
- E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING