136317 ⎘
Methods or devices for use in mines or tunnels, not covered elsewhere; Dams, e.g. for ventilation inflatable
AIRLOCK WITH A PNEUMATIC ORIFICE FOR THE VACUUM TRAIN SYSTEM
#2Sealing system
#3Combined automatic anti-explosion method for gas drainage pipeline
#4Pumpable mine ventilation structure
#5Inflatable Article with Reduced Stress Concentrations
#6Expanding structures, and device and method for expanding the same
#7Removable barrier for protecting tunnels and other structures from flooding and other hazards
#8Pumpable mine ventilation structure
#9CONTAINER FOR FORMING A BARRIER IN AN ENCLOSED ENVIRONMENT
#10Inflatable tunnel seal
#11Mine barrier survival system
#12Tunnel barrier