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回線 : 53 phrases in 10 subjects |
| Antennas and waveguides | 1 |
| Electricity generation | 1 |
| Electronics | 2 |
| Microsoft | 3 |
| Power lines | 8 |
| Radio | 3 |
| Sound recording | 1 |
| Telecommunications | 15 |
| Telegraphy | 12 |
| Telephony | 7 |
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