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optical sound
| recording
| optical sound | |
| opt. | Lichtton |
| recording | |
| gen. | Bildaufnahme; Aufzeichnung; Einspielung; Mitschnitt |
| phys. | Aufnahme |
| stat. | Anschreibung |
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| Lichtton m | |||
| optical sound: 24 phrases in 6 subjects |
| Earth sciences | 1 |
| Electronics | 1 |
| Industry | 1 |
| Optics branch of physics | 9 |
| Patents | 9 |
| Technology | 3 |
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