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| 套管的联顶接; 注水泥胶塞座圈 | |||
| 套管连顶接箍 | |||
| 吊环; 止塞箍; 坐放箍 | |||
| 套管的连顶接箍; 吊环 (吊套管用) | |||
| landing collar: 2 phrases in 2 subjects |
| Drilling | 1 |
| Oil / petroleum | 1 |
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