history 183 military aircrafts 138 electronic circuits 130 air force 127 material testing 110 thermal insulation 77 sugar beet 74 more ... aircraft construction 70 nuclear safety 62 roofs 60 architecture 51 nuclear power stations 50 roof covering 49 construction materials 45 building designing 41 simulation and modelling 41 casting 40 concrete constructions 39 radio receivers 38 production 38 electronics 37 protection of buildings 37 radio transmitters 37 front walls 36 tunneling works 36 concretes 35 measurement 35 waterproof insulations 34 radiocommunications 33 descriptive geometry 32 less ...