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Hydraulic jar device
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Patent number 7,163,058
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Issue date Jan 16, 2007
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Bakke Technology, AS
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Stig Bakke
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E21 - EARTH DRILLING MINING
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Releasable connector
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Patent number 6,450,541
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Issue date Sep 17, 2002
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Bakke Technology AS
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Stig Bakke
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E21 - EARTH DRILLING MINING
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Impact tool
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Patent number 6,164,393
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Issue date Dec 26, 2000
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Bakke Technology AS
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Stig Bakke
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E21 - EARTH DRILLING MINING