 |
| |||
| система тональных сигналов | |||
| voice-frequency system: 12 phrases in 6 subjects |
| Communications | 2 |
| Electronics | 1 |
| Mass media | 4 |
| Rail transport | 1 |
| Technology | 3 |
| Telecommunications | 1 |
|
| |||
| система тональных сигналов | |||
| voice-frequency system: 12 phrases in 6 subjects |
| Communications | 2 |
| Electronics | 1 |
| Mass media | 4 |
| Rail transport | 1 |
| Technology | 3 |
| Telecommunications | 1 |