Transportation
| Mon 11 May 2026
Beijing, May 11 -- Shijiazhuang Tiedao University, Yungui Railway Yunnan Co Ltd and China Railway Tunnel Group have applied Chinese patent for Double-pipe Drilling Machine for Tunnel Construction. Xu Fei, Zhu Suning, Zhai Jianping, Liu Xueting, Gao Pan, Qin Chengshuai, Liu Jianbing, Yin Xueping, Li Junwei, Ma Tongze and Zhu Yani..