GEFRO OILFIELD SERVICES AS

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N-4056 TANANGER, NO

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Patents Grantslast 30 patents

Information Patent Grant
Bidirectional hydraulic jar
- Patent number 5,803,182
- Issue date Sep 8, 1998
- Gefro Oilfield Services
- Stig Erling Bakke
- E21 - EARTH DRILLING MINING