protection cover: 29 phrases in 14 subjects |
Astronautics | 7 |
Building materials | 1 |
Cables and cable production | 3 |
Construction | 1 |
Electronics | 1 |
Firefighting and fire-control systems | 1 |
Insurance | 1 |
Mass media | 1 |
Military | 3 |
Polygraphy | 1 |
Road construction | 1 |
Security systems | 1 |
Technology | 5 |
Weapons of mass destruction | 2 |