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| voie sémaphore | |||
| canal sémaphore; voie de signalisation | |||
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signalling channel : 39 phrases in 7 subjects |
| Communications | 7 |
| Earth sciences | 1 |
| Electronics | 14 |
| General | 3 |
| Information technology | 7 |
| Telecommunications | 5 |
| Telegraphy | 2 |
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