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Roller clutch
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Fluid actuated downhole drilling device
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Methods and apparatus for transmitting information through a pipe string
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Method and apparatus for actuating a downhole device carried by a pipe string
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Method and apparatus for indicating the orientation of a down hole drilling assembly
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Device for drilling a hole in the side wall of a bore hole
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Roller clutch
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Curvable pipe section
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Method and apparatus for actuating downhole devices
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Drilling apparatus
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Apparatus for employing a portion of an electrically conductive fluid flowing in a pipeline as an electrical conductor
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Apparatus for prestressing a structural member
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