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| overspeed protection unit | |||
| overspeed protection device; emergency governor; overspeed protective device | |||
| over-speed protective device | |||
| safe device against over-speed | |||
| overspeed device | |||
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| overspeed protection | |||
| 超速 保护装置: 2 phrases in 2 subjects |
| Hydroelectric power stations | 1 |
| Technology | 1 |