HEFEI DESIGN AND RESEARCH INSTITUTE OF COAL INDUSTRY CO., LTD

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HEFEI, CN

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Patents Grantslast 30 patents

Information Patent Grant
Full-face shaft tunnel boring machine system
- Patent number 11,891,865
- Issue date Feb 6, 2024
- HEFEI DESIGN & RESEARCH INSTITUTE OF COAL INDUSTRY CO., LTD
- Huidong Xu
- E21 - EARTH DRILLING MINING
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

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Patents Applicationslast 30 patents

Information Patent Application
FULL-FACE SHAFT TUNNEL BORING MACHINE SYSTEM
- Publication number 20240068308
- Publication date Feb 29, 2024
- HEFEI DESIGN & RESEARCH INSTITUTE OF COAL INDUSTRY CO., LTD
- Huidong XU
- E21 - EARTH DRILLING MINING