Feng CHENG

Follow

Person

Xi 'an, CN

People

Patents Grantslast 30 patents

Information Patent Grant
Split air cabin ventilation system for construction of tunnel incli...
- Patent number 11,674,392
- Issue date Jun 13, 2023
- CHINA RAILWAY BEIJING ENGINEERING GROUP CO., LTD
- Shuangqin Chen
- E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents

Information Patent Application
SPLIT AIR CABIN VENTILATION SYSTEM FOR CONSTRUCTION OF TUNNEL INCLI...
- Publication number 20210207481
- Publication date Jul 8, 2021
- CHINA RAILWAY BEIJING ENGINEERING GROUP CO.,LTD
- Shuangqin CHEN
- E21 - EARTH DRILLING MINING