 |
|
warning-signal : 57 phrases in 30 subjects |
| Air defense | 5 |
| Apollo-Soyuz | 1 |
| Armored vehicles | 3 |
| Astronautics | 3 |
| Automated equipment | 1 |
| Automobiles | 4 |
| Construction | 2 |
| Electrical engineering | 1 |
| Electronics | 1 |
| Fighter aviation | 1 |
| General | 2 |
| Geology | 1 |
| Makarov | 1 |
| Maritime law & Law of the Sea | 1 |
| Military | 1 |
| Missiles | 1 |
| Nanotechnology | 1 |
| Nautical | 3 |
| Navigation | 1 |
| Non-destructive testing | 4 |
| Obsolete / dated | 3 |
| Physics | 1 |
| Radioengineering | 1 |
| Rail transport | 1 |
| Road works | 1 |
| Space | 2 |
| Technology | 5 |
| Telecommunications | 2 |
| Telephony | 1 |
| Transport | 2 |