Patent classifications
E
FIXED CONSTRUCTIONS
Load children
E21
EARTH OR ROCK DRILLING; MINING
Load children
E21D
SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
Load children
9/00
Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
Load children Filter patents View analytics View as hierarchy
E21D9/06
Making by using a driving shield; , i.e. advanced by pushing means bearing against the already placed lining
Load children Filter patents View analytics View as hierarchy
E21D9/093
Control of the driving shield; , e.g. of the hydraulic advancing cylinders
Filter patents View analytics View as hierarchy