Gerd Westerdorff

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Dusseldorf, DE

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Patents Grantslast 30 patents

Information Patent Grant
Concrete crosstie with recesses and method for the production thereof
- Patent number 4,634,049
- Issue date Jan 6, 1987
- Hoesch Aktiengesellschaft
- Horst E. Steinfeld
- B28 - WORKING CEMENT, CLAY, OR STONE