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SU1707180A1
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Diamond crown bit
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SU1707179A1
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Rock drilling tool
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SU1668625A1
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Drill pipe protector
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SU1592461A1
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Impact mechanism of drilling rig
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SU1675539A1
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Roller drill bit
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SU1707175A1
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Three-cone rock drilling bit
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SU1633012A1
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Method of hardening the outer surface of cylindrical part
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SU1609948A1
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Core-taker
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SU1573136A1
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Auxilliary block for drilling installation
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SU1627636A1
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Hydraulic impact tool
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SU1745849A1
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Hydraulic percussion machine
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SU1595927A1
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Method of strengthening treatment of articles
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SU1677234A1
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Adjustable roller-cutter calibrator
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SU1585494A1
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Arrangement for flushing a borehole in drilling with twin drill string with hydraulic conveying of core material
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SU1550358A1
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Slime of cyclic action slime collector for rock samples in air-percussion drilling
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SU1752915A1
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Drilling tool
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SU1601317A1
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Supporting and centering member of drill string
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SU1654516A1
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Roller gager
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SU1663171A1
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Roller cutter drilling bit
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SU1574788A1
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Double boring pipe
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