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Method for determining drilling parameters of drainage water of coal seam roof
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Drill rod male joint, automatic plug-in type spiral drill rod and construction method of automatic plug-in type spiral drill rod
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Method for predicting water inflow of deep-buried working face in western mining area
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Horizontal directional core drilling straightening and deviation correcting drilling tool and drilling method
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Variable-diameter PDC (polycrystalline diamond compact) directional drill bit
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Underground coal mine drilling multistage deslagging air screw motor
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It is a kind of to weaken the microseism localization method and device for relying on first break pickup precision
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A kind of Split-type vehicle-carrying rig and its construction method
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Both-end blocks water filling device in hole
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Drilling rod conveying robot based on truss
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Underground drill rig changes bar hydraulic efficiency manipulator
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Double coal seam four-way packer layered pressure controls combine mining device and method
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A kind of coal seam Love type groove wave pressure compression methods and device based on frequency domain
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The hexahedral mesh partitioning of taper thread joint
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