Churn drill 冲击钻 ; 钢丝绳钻机 ; 旋冲钻 ; 顿钻

hand churn drill 手动钢丝绳钻机 ; 手动钢绳冲击式钻机

churn-drill bit 冲击钻头

churn shot drill [机] 顿砂钻

churn-type percussion drill 无游梁绳式顿钻钻机

rod churn drill 空心杆冲钻

hollow-rod churn drill 空心杆冲钻 ; 空心冲钻

churn-drill rig 钢绳冲击式钻机

hollowrod churn drill 空心杆冲钻

churn n drill 钢丝绳钻机