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| 杆夹紧装置 | |||
| 钻杆夹头; 钻杆夹板 | |||
| 钻杆夹持器 | |||
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rod clamp : 11 phrases in 3 subjects |
| Oil / petroleum | 4 |
| Plastics | 1 |
| Technology | 6 |
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