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| screw pipe union | |||
| screw connection; screw fitting; screw pipe coupling; screw pipe joint | |||
| 螺纹管节: 8 phrases in 5 subjects |
| Architecture | 2 |
| Compressors | 2 |
| Mechanics | 1 |
| Oil / petroleum | 2 |
| Technology | 1 |
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