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| 方钻杆防喷安全阀 | |||
| 方钻杆阀; 方钻杆旋塞 | |||
| 方钻杆上部阀 | |||
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| 方钻杆旋塞 | |||
| kelly cock: 9 phrases in 3 subjects |
| Drilling | 4 |
| Metallurgy | 1 |
| Oil / petroleum | 4 |
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