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| core cross section | |||
| сечение скважины: 23 phrases in 8 subjects |
| Drilling | 4 |
| Geology | 1 |
| Geophysics | 2 |
| Mining | 4 |
| Oil / petroleum | 8 |
| Oil and gas | 2 |
| Oil and gas technology | 1 |
| Welding | 1 |
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