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| flushing port; drilling bit mud-discharge port; drilling bit water port | |||
| bit flush port; bit mud-discharge port; bit water port; drilling bit flush port | |||
| промывочный канал долота: 12 phrases in 5 subjects |
| Drilling | 1 |
| Oil / petroleum | 6 |
| Oil and gas | 2 |
| Oil and gas technology | 1 |
| Oilfields | 2 |