 |
|
relay switching : 40 phrases in 15 subjects |
| Armored vehicles | 1 |
| Astronautics | 1 |
| Automobiles | 1 |
| Aviation | 1 |
| Communications | 2 |
| Electrical engineering | 1 |
| Electronics | 1 |
| General | 1 |
| Mass media | 2 |
| Occupational health & safety | 4 |
| Rail transport | 2 |
| Soviet | 3 |
| Space | 2 |
| Technology | 15 |
| Telecommunications | 3 |