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| système de signalisation; méthode de signalisation centrale; système de signalisation par voie commune; canal commun de signalisation (méthode, système) | |||
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Zeichengabesystem : 9 phrases in 4 subjects |
| Communications | 2 |
| Electronics | 2 |
| Information technology | 2 |
| Telecommunications | 3 |
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