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image optique : 16 phrases in 9 subjects |
| Astronautics | 1 |
| Cinema equipment | 1 |
| Medical appliances | 1 |
| Metallurgy | 1 |
| Nuclear physics | 1 |
| Polygraphy | 2 |
| Radio | 3 |
| Surveying | 5 |
| Technology | 1 |
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