| |||
audible warning system | |||
voice frequency signaling system |
звуковая система сигнализации : 18 phrases in 10 subjects |
Astronautics | 2 |
Automated equipment | 1 |
Construction | 2 |
Firefighting and fire-control systems | 2 |
Military | 1 |
Mining | 3 |
Public utilities | 1 |
Rail transport | 1 |
Technology | 4 |
Telecommunications | 1 |