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| tool in hole; downhole tool | |||
| letting-in tool | |||
| 下井工具: 23 phrases in 8 subjects |
| Company name | 1 |
| Drilling | 6 |
| Earth sciences | 1 |
| Geophysics | 2 |
| Mechanics | 1 |
| Mining | 1 |
| Oil / petroleum | 9 |
| Technology | 2 |
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