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Transient electromagnetic method ground hole detection method and device
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CN103995295A
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Direct current electric method ground hole detection method and device
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Horizontal well forced gas drainage method with coal bed gas subjected to staged fracturing
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CN103924945A
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High-pressure grouting process of water-rich weathering fracture rock formation below thick unconsolidated formation for coal mine
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CN103925202A
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Accumulated water pumping and discharging hole bottom pump for coal mine
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CN103924934A
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Slip component for rubber sleeve type hydraulic chuck
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CN103925261A
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Electrohydraulic-control anti-collision device for drilling machines
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CN103806935A
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Hole reinforcement and outburst prevention device
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Onboard split type multi-angle scraper conveyor
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CN103643707A
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Roadway repair machine integrating drilling, digging, transporting and loading
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CN103643908A
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Hydraulic break-out tongs with screw thread protection function
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CN103643909A
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Double clamp structure suitable for automatically screwing/unscrewing drill rod of underground drill rig
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CN103643994A
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Method for controlling water inrush and sand inrush under coal mine
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CN103643893A
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Sieve tube drilling process for outburst coal seam section in underground coal mine
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Split type simulation experiment device for high-pressure grouting of sand layer
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Downhole drill gesture measuring instrument and measuring method thereof
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CN103452506A
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Defoaming device and method for coal-mine foam drilling
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CN103452508A
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Method and device for constructing bedding gas extraction long drilled holes of soft coal seams
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CN103452546A
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High-precision and long-distance depth detecting device and method for drill hole by adopting inertia pressure wave
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