Tage Fridolfsson

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St. Germain-en Laye, FR

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Patents Grantslast 30 patents

Information Patent Grant
Land drainage system
- Patent number 4,704,047
- Issue date Nov 3, 1987
- Oy Wartsila AB
- Sven Oldfelt
- E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES