Olav Skyllingstad

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Epouvilles, FR

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Patents Grantslast 30 patents

Information Patent Grant
Valve device having stationary and movable or turnable valve bodies
- Patent number 5,246,035
- Issue date Sep 21, 1993
- Norsk Hydro a.s
- Olav Skyllingstad
- E21 - EARTH DRILLING MINING