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| Optoschalter m (FO) | |||
| optische Vermittlung; optischer Schalter; optisches Vermittlungssystem | |||
| optische Schaltung | |||
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optical switch : 10 phrases in 6 subjects |
| Automated equipment | 1 |
| Communications | 2 |
| Earth sciences | 1 |
| Electronics | 4 |
| Materials science | 1 |
| Optics branch of physics | 1 |