gasworks industry 181 history 38 natural gas 38 business balance sheet 18 gas pipes 17 town gas 14 gas fuels 13 more ... production 10 power engineering 8 cooling mechanisms 7 gases 7 bunkers 7 safety 6 underground structures 6 public lighting 6 water supply engineering 6 equipment 6 treatment 6 lighting engineering 5 house gas pipelines 4 fuels (chemistry) 4 plynárenské technologie 4 rebuildings 4 ropný průmysl 4 storage 4 technical standards 4 architectural designs 3 firm 3 cultural constructions 3 materials handling 3 less ...