Walter Stegmanns

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Oberhausen, DE

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Patents Grantslast 30 patents

Information Patent Grant
Suction of gases from boreholes in coal mining
- Patent number 4,321,967
- Issue date Mar 30, 1982
- Maschinenfabrik Korfmann GmbH
- Uwe Koppe
- E21 - EARTH DRILLING MINING