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Adjustable multifunctional petroleum drilling machine moving guide rail
Apparatus and method for pre-loading mechanical constant-resistance single prop
Automatic hoisting control system and device for drill rod of twist drill coal mining machine
Emergency protection device for underground mining of coal mine
Railway tunnel contact net rail groove mounting device and mounting method
Sea-to-sea directional drilling and crossing operation system and method
Steel wire rope traction monorail crane for conveying mining material equipment
Suspension lifting rope guide wheel device and using method thereof
Thin seam shuttle car with synchronous tooth based space steering mechanism
Underground coal mine trackless auxiliary transportation robot