Haiyan Cheng

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Huainan, CN

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Patents Grantslast 30 patents

Information Patent Grant
Level instrument and method for surveying mining subsidence zone in...
- Patent number 12,044,531
- Issue date Jul 23, 2024
- PING AN COAL MINING ENGINEERING TEC
- Bo Xue
- G01 - MEASURING TESTING

Patents Applicationslast 30 patents

Information Patent Application
METHOD FOR SCREENING KEY STRATUM FOR OVERBURDEN SEPARATION GROUTING...
- Publication number 20250059889
- Publication date Feb 20, 2025
- PING AN COAL MINING ENGINEERING TECHNOLOGY RESEARCH INSTITUTE CO., LTD
- Hongjie SUN
- E21 - EARTH DRILLING MINING