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| Nachweissystem n | |||
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detecting system : 22 phrases in 11 subjects |
| Agriculture | 4 |
| Automated equipment | 2 |
| Communications | 1 |
| Computers | 1 |
| Electronics | 5 |
| General | 1 |
| Information technology | 1 |
| Metallurgy | 1 |
| Optics branch of physics | 3 |
| Technology | 1 |
| Telegraphy | 2 |