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canal m; canal de frecuencias |
frequency channel: 71 phrases in 10 subjects |
Communications | 29 |
Earth sciences | 2 |
Electronics | 27 |
Information technology | 4 |
Mechanic engineering | 1 |
Meteorology | 1 |
Natural sciences | 1 |
Power lines | 3 |
Technology | 2 |
Transport | 1 |