Qingsheng JIA

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Dongying City, CN

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Patents Grantslast 30 patents

Information Patent Grant
Device for handling oil pipes and method for workover
- Patent number 9,932,784
- Issue date Apr 3, 2018
- China Petroleum and Chemical Corporation
- Zenglin Wang
- E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents

Information Patent Application
DEVICE FOR HANDLING OIL PIPES AND METHOD FOR WORKOVER
- Publication number 20160281445
- Publication date Sep 29, 2016
- China Petroleum and Chemical Corporation
- Zenglin WANG
- E21 - EARTH DRILLING MINING