Jianguo Ding

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Hefei, CN

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Patents Grantslast 30 patents

Information Patent Grant
Cageway connecting device and connecting method thereof
- Patent number 11,199,091
- Issue date Dec 14, 2021
- Hefei Design & Research Inst. Of Coal Industry Co., LTD.
- Qiang Qin
- E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents

Information Patent Application
CAGEWAY CONNECTING DEVICE AND CONNECTING METHOD THEREOF
- Publication number 20200232321
- Publication date Jul 23, 2020
- HEFEI DESIGH AND RESEARCH INSTITUTE OF COAL INDUSTRY CO., LTD.
- Qiang Qin
- E21 - EARTH DRILLING MINING