Patents/Inventors

Zhengang Ma

ChongQingCN7 patents

4 Patents

US125843562026
Power Head of Directional Drill
CCTEG Chongqing Research Institute Co., Ltd.
0 cites
US125600282026
Coal Mine Automatic Directional Drill
CCTEG Chongqing Research Institute Co., Ltd.
0 cites
US125099432025
Combined Drilling System with Double Rotary Driving Devices and Control Method Therefor
CCTEG Chongqing Research Institute Co., Ltd.
0 cites
US124488472025
Coal Mine Intelligent Directional Drill and Drilling Method Therefor
CCTEG Chongqing Research Institute Co., Ltd.
0 cites