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| optischer Schalter | |||
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| optischer Schalter; optisches Vermittlungssystem | |||
| optische Schaltung | |||
| optic switch: 23 phrases in 7 subjects |
| Communications | 2 |
| Earth sciences | 1 |
| Electronics | 11 |
| General | 4 |
| Information technology | 3 |
| Materials science | 1 |
| Optics branch of physics | 1 |