 |
| |||
| sonic signaling | |||
| sound communication | |||
| acoustic alarm (igisheva) | |||
| sound signalling (oleg.vigodsky) | |||
| акустическая сигнализация: 11 phrases in 7 subjects |
| Energy industry | 1 |
| Firefighting and fire-control systems | 1 |
| Military | 1 |
| Security systems | 1 |
| Signalling | 1 |
| Technology | 1 |
| Telecommunications | 5 |