松软煤层狭窄巷道大扭矩两体式履带钻机的研制与应用
송연매층협착항도대뉴구량체식리대찬궤적연제여응용
Development and Application of High Torque and Two Postures Full Hydraulic Tracked Drill Rig in Narrow Coal Mine Roadways and Soft Coal Seam
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