 |
| |||
| DTMF signal (Sergey Old Soldier) | |||
| тоновый сигнал: 5 phrases in 5 subjects |
| Communications | 1 |
| Hi-Fi | 1 |
| Information technology | 1 |
| Mass media | 1 |
| Military | 1 |
|
| |||
| DTMF signal (Sergey Old Soldier) | |||
| тоновый сигнал: 5 phrases in 5 subjects |
| Communications | 1 |
| Hi-Fi | 1 |
| Information technology | 1 |
| Mass media | 1 |
| Military | 1 |