 |
| |||
| telephone emission | |||
| telephone signal | |||
| phone signal (oleg.vigodsky) | |||
| телефонный сигнал: 98 phrases in 10 subjects |
| Communications | 1 |
| Electronics | 5 |
| Information security and data protection | 3 |
| Makarov | 1 |
| Mass media | 66 |
| Metrology | 1 |
| Military | 1 |
| Security systems | 3 |
| Technology | 6 |
| Telecommunications | 11 |