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on-hook signal; on-hook sign |
сигнал "свободно : 50 phrases in 16 subjects |
American usage, not spelling | 1 |
Astronautics | 2 |
Communications | 1 |
Electronics | 2 |
Makarov | 3 |
Mass media | 8 |
Medical | 3 |
Medical appliances | 1 |
Microelectronics | 1 |
Military | 2 |
Radiology | 1 |
Rail transport | 13 |
Spectroscopy | 2 |
Technology | 3 |
Telecommunications | 2 |
Telephony | 5 |