Werner Durrfeld

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Herten, DE

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Patents Grantslast 30 patents

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Method and device for the backfilling of roadway supports in mine a...
- Patent number 4,465,405
- Issue date Aug 14, 1984
- GTG Gesteins- und Tiefbau GmbH
- Werner Durrfeld
- E21 - EARTH DRILLING MINING