135977 ⎘
Tunnels or galleries, with or without linings; Methods or apparatus for making thereof ; Layout of tunnels or galleries Driving inclined tunnels or galleries
Split air cabin ventilation system for construction of tunnel inclined shaft and ventilation method using same
#2System and Method for Preventing an Explosion of a Caldera
#3Hydro-electric site and method for constructing a penstock
#4Overhead rail system having chariots moving longitudinally along the rail system
#5Mining site having a shallow angle extraction shaft, shallow angle mining method and method for constructing a penstock
#6Tunneling apparatus