Aloysius G. Roggekamp

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Alphen an der Rijn, NL

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Patents Grantslast 30 patents

Information Patent Grant
Watertight seal between two concrete elements
- Patent number 4,449,720
- Issue date May 22, 1984
- Ballast-Nedam Groep N.V.
- Tjako A. Wolters
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...