Hans Lewer

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Witten-Annen, DT

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Patents Grantslast 30 patents

Information Patent Grant
Prevention of self-ignition (spontaneous ignition) of coal through...
- Patent number 3,990,517
- Issue date Nov 9, 1976
- Chemische Fabrik Kalk GmbH
- Hans Lewer
- E21 - EARTH DRILLING MINING