gas - grat
- gas absorption
- gas analyser
- gas bearing seam
- gas blower
- gas bodies
- gas bubble
- gas burst
- gas cleaning
- gas clearing
- gas coal
- gas content
- gas content determination
- gas control
- gas detection system
- gas detector
- gas detector electric lamp
- gas drainage from a working seam
- gas emission
- gas explosion
- gas factor
- gas holder
- gas ignition
- gas indicator
- gas input factor
- gas inrush
- gas level
- gas monitor
- gas nest
- gas outburst
- gas permeability of rocks
- gas pocket
- gas pollution
- gas release
- gas rescue service
- gas retention capacity of coal
- gas rush
- gas sensing equipment
- gas sensing system
- gas spout
- gas storage capacity
