Alv Hanstvedt

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Dimmelsvik, NO

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Patents Grantslast 30 patents

Information Patent Grant
Device and a method for drainage of water from rock caves
- Patent number 7,513,712
- Issue date Apr 7, 2009
- Giertsen Tunnel AS
- Alv Hanstvedt
- E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents

Information Patent Application
Device and a method for drainage of water from rock caves
- Publication number 20050097845
- Publication date May 12, 2005
- Giertsen Tunnel AS
- Alv Hanstvedt
- E21 - EARTH DRILLING MINING