history 183 military aircrafts 138 electronic circuits 129 air force 127 material testing 110 thermal insulation 77 sugar beet 74 more ... aircraft construction 70 nuclear safety 62 roofs 60 nuclear power stations 49 roof covering 49 architecture 47 construction materials 40 radio receivers 38 simulation and modelling 38 electronics 37 protection of buildings 37 building designing 37 radio transmitters 37 front walls 36 tunneling works 36 concretes 35 casting 35 waterproof insulations 34 production 34 measurement 33 radiocommunications 33 concrete constructions 32 descriptive geometry 32 less ...