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| spur gear drive | |||
| spur gear on parallel axes | |||
| spur-gear drive | |||
| 正齿 轮 传动: 11 phrases in 5 subjects |
| Hydroelectric power stations | 1 |
| Metallurgy | 1 |
| Shipbuilding | 1 |
| Technology | 7 |
| Wind Energy | 1 |
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