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| voice-frequency multichannel system; voice-frequency multichannel telegraphy; voice-frequency multiplex telegraph system | |||
| система многоканального тонального телеграфирования: 3 phrases in 2 subjects |
| Communications | 1 |
| Mass media | 2 |
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| |||
| voice-frequency multichannel system; voice-frequency multichannel telegraphy; voice-frequency multiplex telegraph system | |||
| система многоканального тонального телеграфирования: 3 phrases in 2 subjects |
| Communications | 1 |
| Mass media | 2 |