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| circuito virtuale; circuito simplex; linea virtuale; circuito fantasma | |||
| circuito virtuale con ritorno a terra | |||
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circuito fantasma : 8 phrases in 4 subjects |
| Communications | 5 |
| Information technology | 1 |
| Power lines | 1 |
| Telegraphy | 1 |
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