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| helicoid hydraulic motor; positive displacement drill | |||
| screwdrill | |||
| helicoids drill | |||
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螺杆 钻具 : 13 phrases in 5 subjects |
| Drilling | 2 |
| General | 1 |
| Mechanics | 1 |
| Oil / petroleum | 6 |
| Technology | 3 |
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