135952 ⎘
Raising shafts, i.e. working upwards from the bottom
Stall Control System for Raise Drills and Raise Boring Machines
#2Method and apparatus for the bottom-up construction of vertical risers from underground passes through the soil, using a pipe jacking equipment
#3Battery powered mechanized raise climbing system
#4Side shift raise climbing system
#5Securing arrangement for reamers in raise boring