 |
| |||
| audio alarm system | |||
| acoustic signalling system | |||
| call-bell system (между стволовым в околоствольном дворе и рукоятчиком на поверхности); open bell system (между стволовым в околоствольном дворе и рукоятчиком на поверхности) | |||
| acoustic signaling system; audible warning system; acoustic warning system; aural warning system | |||
| sound alarm system | |||
| |||
| audio warning system | |||
| audio distribution system | |||
| система звуковой сигнализации: 9 phrases in 7 subjects |
| Astronautics | 2 |
| Construction | 1 |
| Firefighting and fire-control systems | 2 |
| Mining | 1 |
| Public utilities | 1 |
| Rail transport | 1 |
| Technology | 1 |