Kjell-Egil Stangeland

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Kleppe, NO

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Patents Grantslast 30 patents

Information Patent Grant
Hole opener for the top hole section of oil/gas wells
- Patent number 5,337,843
- Issue date Aug 16, 1994
- Kverneland Klepp AS
- Tor Torgrimsen
- E21 - EARTH DRILLING MINING