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| 铃流发电机 | |||
| 铃流振荡器; 铃流发电机; 电动磁石发电机 | |||
| 铃流发生器 | |||
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ringing generator : 3 phrases in 3 subjects |
| Communications | 1 |
| Technology | 1 |
| Telecommunications | 1 |
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