Yong An Wang

Qingdao Haijian Holdings Co., Ltd. engages in the provision of laboratory testing, calibration, inspection, inspection, cargo inspection, and product service certification services. The company was founded on December 16, 2019 and is headquartered in Qingdao, China.

Qingdao Haijian Group Co., Ltd. is a Chinese company that provides marine equipment quality inspection services through its subsidiaries, including Haijian Inspection and Testing, Haijian Center, and Marine Equipment Quality Inspection Center. The company was founded in 2014 and is based in Qingdao City, China. The company is ultimately controlled by the City of Qingdao (China).

Xi'an Aohua Electronic Instrument Co., Ltd. engages in the research and development and manufactures of petroleum logging and testing instruments. Its products include exploration of petroleum and testing, digital signal controller single-core multi-function water flow logging tools, Schlumberger's water flow log neutron oxygen activated water flow logging tools, pulsed neutron full-spectrum saturation well logging tool, element logging tool, and high precision remaining oil saturation logging tools. The company was founded on March 1, 2001 and is headquartered in Xi'an, China.