mining 45 machine parts and joints 21 boilers 19 koroze materialu 18 ohrana materialu 18 products 17 chemical industry 16 more ... power engineering 15 fuels (transport) 15 fuels (chemistry) 14 fire protection 13 biofuels 11 lesniké stroje 10 zemědělské a lesnické stroje 10 combustion 8 nuclear safety 7 burnt down nuclear fuel 7 solid fuel boilers 7 forestry 7 gas fuels 6 gasworks industry 6 road vehicles 6 air pollution 6 ethylalcohol 5 nuclear fuels 5 spark-ignition engines 5 cars 4 issues 4 temporary storage for radioactive wastes 4 environment protection 4 less ...