GAO Shen-you
China Geological Equipment Group Co., Ltd.SUN Jian-hua
The Institute of Exploration Techniques, CAGSCAI Ji-xiong
Wuxi Drilling Tools Factory Co., Ltd.LIU Di-lei
Wuxi Drilling Tools Factory Co., Ltd.China Geological Equipment Group Co., Ltd.,The Institute of Exploration Techniques, CAGS,Wuxi Drilling Tools Factory Co., Ltd.,Wuxi Drilling Tools Factory Co., Ltd.