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Free fall stroker apparatus and method
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Reinforced valve member
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Mounting for the mast of a drilling rig for drilling either vertical or slanting holes
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Rotary drilling rig and angle drive therefor
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Magazine for storing and handling drill pipe in rotary drilling rig
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Drill pipe sections and method of and apparatus for automatically breaking out the connections thereof
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Level winding mechanism and adjusting means therefor
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Method and apparatus for electrical logging of bore holes
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Drilling rig
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Electrical well-logging apparatus
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Instrument calibration circuit
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Safety clevis
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Apparatus for circulating drilling fluid in rotary drilling
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Apparatus for circulating drilling fluid in rotary drill
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Breakout table for use with a portable drilling rig
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Drill bit
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Magazine for storing and handling drill pipe in rotary drilling rig
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Derrick
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CA569651A
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Safety clevis
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CA727844A
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Mounting for the mast of a drilling rig for drilling either vertical or slanting holes
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