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Drilling rig
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Patent number 7,584,796
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Issue date Sep 8, 2009
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Coupler Developments Limited
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Laurence John Ayling
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E21 - EARTH DRILLING MINING
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Radially moving slips
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Patent number 7,395,855
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Issue date Jul 8, 2008
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Coupler Developments Limited
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Laurence John Ayling
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E21 - EARTH DRILLING MINING
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Drilling method
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Patent number 7,252,151
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Issue date Aug 7, 2007
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Coupler Developments Limited
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Laurence John Ayling
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E21 - EARTH DRILLING MINING
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Drilling method
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Patent number 7,188,683
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Issue date Mar 13, 2007
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Coupler Developments Limited
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Laurence John Ayling
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E21 - EARTH DRILLING MINING
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Drilling methods and apparatus
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Patent number 6,688,394
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Issue date Feb 10, 2004
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Coupler Developments Limited
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Laurence J. Ayling
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E21 - EARTH DRILLING MINING
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Drilling method
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Patent number 6,591,916
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Issue date Jul 15, 2003
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Coupler Developments Limited
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Laurence John Ayling
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E21 - EARTH DRILLING MINING
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