Patent classifications
E
FIXED CONSTRUCTIONS
Load children
E21
EARTH OR ROCK DRILLING; MINING
Load children
E21D
SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
Load children
E21D20/003
Machines for drilling anchor holes and setting anchor bolts
Load children Filter patents View analytics View as hierarchy
E21D20/006
having magazines for storing and feeding anchoring-bolts
Filter patents View analytics View as hierarchy