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US6059050A
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Apparatus for controlling relative rotation of a drilling tool in a well bore
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US5485889A
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Steering drill bit while drilling a bore hole
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CA2141737A1
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Drilling a bore hole having a short radius curved section followed by a straight section
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CA2140694A1
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Drilling a well with gas supply in the drilling liquid
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DE19501396A1
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Offset drilling of straight, deviated or curved bores for gas or oil
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CA2096192A1
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Drilling short radius curvature well bores
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