Hua Zhao

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Zhengzhou, CN

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Patents Applicationslast 30 patents

Information Patent Application
Center-pillared Full-Face Shaft Drilling Machine
- Publication number 20160369629
- Publication date Dec 22, 2016
- CHINA RAILWAY ENGINEERING EQUIPMENT GROUP CO., LTD.
- Hua Zhao
- E21 - EARTH DRILLING MINING
Information Patent Application
Vertical Shaft Drilling Rig Using Novel Drilling Method
- Publication number 20160369566
- Publication date Dec 22, 2016
- CHINA RAILWAY ENGINEERING EQUIPMENT GROUP CO., LTD.
- Jianbin LI
- E21 - EARTH DRILLING MINING