Patent classifications
E
FIXED CONSTRUCTIONS
Load children
E21
EARTH OR ROCK DRILLING; MINING
Load children
E21F
SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
Load children
17/00
Methods or devices for use in mines or tunnels, not covered elsewhere
Load children Filter patents View analytics View as hierarchy
E21F17/18
Special adaptations of signalling or alarm devices
Load children Filter patents View analytics View as hierarchy
E21F17/185
Rock-pressure control devices with or without alarm devices; Alarm devices in case of roof subsidence
Filter patents View analytics View as hierarchy