| |||
voice-frequency telegraphy | |||
frequency telegraphy; VF telegraphy (voice-frequency telegraphy) | |||
carrier telegraphy; harmonic telegraphy; tone telegraphy |
тональная телеграфия : 7 phrases in 5 subjects |
Electronics | 3 |
Mass media | 1 |
Military | 1 |
Technology | 1 |
Telecommunications | 1 |