RU1789006C
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Rotary cutter of drill bit
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RU1789010C
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Cap for drill pipes
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SU1752925A1
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Core barrel
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RU1770401C
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Method of continuous-consecutive induction working of drill pipe
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SU1740976A1
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Device for check of diameter of article
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SU1752913A1
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Rotary drill bit
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RU1782262C
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Hydraulic impact machine
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RU1781412C
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Diamond crown bit
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SU1767150A1
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Rolling cutter drilling bit
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SU1767148A1
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Drill bit
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SU1726725A1
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Roller-cutter drilling bit
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SU1702407A1
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Multichannel telemetering system
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SU1665021A1
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Core barrel
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SU1754791A1
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Method of heat treatment of drill pipe
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SU1609982A1
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Device for locating pipe joints
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SU1684468A1
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Drill pipe protector
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RU1786238C
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Drill bit
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SU1640334A1
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Crown bit
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SU1632519A1
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Vibrating separator
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SU866121A1
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Method and apparatus for drilling wells
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