短螺旋钻机钻孔成桩工艺
Drilling-into-pile techniques by the Short Spiral Drill
多用钻孔攻丝夹头
multi-functional drilling and tap holder
管用钻孔攻丝复合刀具
combined pipe tap and drill
钻孔攻丝两用机
drilling and taping machine
轻便钻井装备
portable drilling equipment
冲击式深孔钻机
long-hole percussive machine