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| ионосферное прохождение | |||
| ионосферное распространение | |||
| ионосферное распространение (радиоволн) | |||
| ionospheric propagation: 15 phrases in 6 subjects |
| Electronics | 6 |
| Makarov | 1 |
| Mass media | 1 |
| Military | 3 |
| Radio | 2 |
| Technology | 2 |
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