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| 母接头 | |||
| 内丝扣套管; 内丝扣接头; 内螺纹连接管 | |||
| 内螺纹联结器; 软管内接头 | |||
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female coupling : 3 phrases in 2 subjects |
| Oil / petroleum | 1 |
| Technology | 2 |
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