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| back-water valve | |||
| return valve | |||
| back water valve | |||
| backwater valve; water return valve; return cock | |||
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回 水 阀 : 18 phrases in 6 subjects |
| Drilling | 1 |
| Electric machinery | 1 |
| Mechanics | 1 |
| Nautical | 1 |
| Shipbuilding | 1 |
| Technology | 13 |
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