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| 伞形摩擦轮; 摩擦斜齿轮 | |||
| 锥形摩擦传动机构 | |||
| 摩擦伞齿轮 | |||
| 锥形摩擦轮 | |||
| friction bevel gear: 3 phrases in 3 subjects |
| Drilling | 1 |
| Shipbuilding | 1 |
| Space | 1 |
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