坑道钻机 meaning in English

drifter drill for underground
underground drill rig

Application of model zdy - 5 hydraulic tunnel drilling machine
5型煤矿用全液压坑道钻机的应用
Development of combined hydraulic chuck of roadway drilling machine
坑道钻机组合式液压卡盘的研制
Development of zy3500 mine fully hydraulic roadway drilling machine
3500煤矿用全液压坑道钻机的研制
Underground drelling rig ygk - 300 type
坑道钻机ygk 300型