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| unité de signalisation | |||
| trame sémaphore | |||
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| unité de signalisation; élément de signalisation | |||
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signal unit : 58 phrases in 8 subjects |
| Communications | 18 |
| Electronics | 22 |
| General | 1 |
| Information technology | 3 |
| Rail transport | 2 |
| Technology | 2 |
| Telecommunications | 6 |
| Transport | 4 |