Heinrich Jan Roelofs

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Western Austrailia, AU

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Patents Applicationslast 30 patents

Information Patent Application
Shaft Plugging System
- Publication number 20080196885
- Publication date Aug 21, 2008
- Heinrich Jan Roelofs
- E21 - EARTH DRILLING MINING
Information Patent Application
Tunnel Barrier
- Publication number 20080190032
- Publication date Aug 14, 2008
- Heinrich Jan Roelofs
- E21 - EARTH DRILLING MINING