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bassa frequenza : 46 phrases in 13 subjects |
| Automated equipment | 1 |
| Communications | 12 |
| Earth sciences | 1 |
| Electric motors | 1 |
| Electronics | 21 |
| Environment | 1 |
| General | 1 |
| Information technology | 1 |
| Mechanic engineering | 1 |
| Medical | 1 |
| Metallurgy | 1 |
| Power lines | 2 |
| Transport | 2 |
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