Inventor

ZHANG DUANGUANG

CN2 patents

Patents

2 patents

US12234692B2Feb 25, 2025

Automated apparatus for oil field drilling and workover operations

SHENGLI OILFIELD SHENGJI PETROLEUM EQUIPMENT CO LTD0 citations35

US12371953B2Jul 29, 2025

Automatic small repair operation system for oil field

SHENGLI OILFIELD SHENGJI PETROLEUM EQUIPMENT CO LTD0 citations31