 |
| |||
| система однополюсного телеграфирования | |||
|
continuous wave system : 3 phrases in 3 subjects |
| Air defense | 1 |
| Astronautics | 1 |
| Electronics | 1 |
|
| |||
| система однополюсного телеграфирования | |||
|
continuous wave system : 3 phrases in 3 subjects |
| Air defense | 1 |
| Astronautics | 1 |
| Electronics | 1 |