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Method and apparatus for parting subsurface well casing from floating drilling vessels
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Power generation apparatus
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Reverse circulation rotary expansible drill bits
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Apparatus for recovering formation wall samples from a bore hole
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Hydraulically expansible drill bits
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Casing severing tool with centering pads and tapered cutters
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Fluid pressure expansible rotary drill bits
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Fluid pressure expansible drill bits
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Retrievable drill bit
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Hydraulic weight control and compensating apparatus
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Hydraulic weight control and compensating apparatus
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Safety weight control and compensating apparatus for subsurface well bore devices
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Directional drilling apparatus
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Apparatus for conditioning well bores
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