Patents/Inventors

Duanguang Zhang

ShandongCN1 patent

2 Patents

US123719532025
Automatic Small Repair Operation System for Oil Field
Shengli Oilfield Shengji Petroleum Equipment Co., Ltd.
0 cites
US122346922025
Automated Apparatus for Oil Field Drilling and Workover Operations
SHENGLI OILFIELD SHENGJI PETROLEUM EQUIPMENT CO., Ltd.
0 cites