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最近美国的英格索尔公司研制了一种新的CMM-2型坑道潜孔钻机。该钻机的钻塔可以利用液压驱动的双头螺旋蜗杆机构回转360°,相当于CMM-1型钻机每边倾斜
Ingersoll-Rand recently developed a new CMM-2 tunnel DTH drill. The rig’s rig can be swiveled 360 ° with a hydraulically driven double-headed auger mechanism, equivalent to tilting on each side of the CMM-1 rig