hole top meaning in English

井口

The wireless digital transmission system of hole top signal
井口信号无线数传系统
It can increase the hole inclination angle range and drill elevation angle hole , while setting the top drive power head and hole top plate toward the opposite direction
4钻机动力头及孔口板调转方向，可钻凿仰孔。
It can increase the hole inclination angle range and drill elevation angle hole , while setting the top drive head and hole top plate toward the opposite direction
动力头及孔口板调转方向，可直接钻凿仰孔，大大增加钻孔倾角范围。
It can increase the hole inclination angle range and drill elevation angle holes , while setting the top drive power head and hole top plate toward the opposite direction
动力头及孔口板调转方向，可直接钻凿仰孔，大大增加钻孔倾角范围。