The utility model belongs to a hole drillingdevice, specifically, a sub-immersed liquid hole drillingdevice.
本实用新型属于一种钻孔装置，具体涉及一种地浸注液钻孔孔口装置。
2
The utility model relates to a square complement core for a well drilling process, which belongs to an appliance of a well drillingdevice.
本实用新型是一种在钻井过程中使用的方补芯，属钻井设备的器具。
3
The cardan type universal joint automatic drillingdevice can improve the production efficiency, reduce the scrap rate and have high safety performance.