IPC E21F5/04

# Status Description
1936000897 Improvements in or relating tothe purification of air and gases
1936004662 Improvements in or relating tothe purification of air and gases
1974074824 MINE SHIELD STRUCTURE
1997045138 Ceased Method and apparatus for stopping the spread of a fire in an underground mine
2000020702 Ceased An apparatus for sucking dust by spraying high-pressure water in a sublevel caving hydraulic support for sublevel caving hydraulic support
2008101131 Expired Boom
2011253890 Lapsed Dust control system and device
2013260691 Filed Process For Applying Rock Dust To A Mine Wall
2016200634 Filed Dust suppressant
2017200629 Filed DUST SUPPRESSION METHOD AND SYSTEM FOR AN AUTONOMOUS DRILLING MACHINE