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segnale di : 24 phrases in 11 subjects |
| Antennas and waveguides | 1 |
| Electric machinery | 1 |
| Electronics | 1 |
| Microsoft | 1 |
| Power lines | 3 |
| Power system protection | 1 |
| Rail transport | 10 |
| Sound recording | 1 |
| Telecommunications | 1 |
| Telegraphy | 2 |
| Vacuum tubes | 2 |
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