blasting agents explosives 7 tunneling works 3 drfting 2 construction works 2 trhací práce 2 tunnels 2 more ... opencast quarry mining 2 safety of work 1 chlorine 1 demolition 1 electronic elements 1 energetické materiály 1 geoengineering 1 excavation 1 hnací hmoty 1 measurement 1 non-ore raw materials 1 fuels (transport) 1 surface mining 1 pyrotechnics 1 seismic equipments 1 seismic survey 1 seismology 1 seismometers 1 sensors 1 civil engineering 1 welding 1 technology 1 pressure 1 less ...