 |
| |||
| затруб (Yeldar Azanbayev) | |||
| annulus valve: 15 phrases in 7 subjects |
| Drilling | 3 |
| Medical | 1 |
| Oil / petroleum | 3 |
| Oil and gas | 1 |
| Oil and gas technology | 5 |
| Oilfields | 1 |
| Sakhalin | 1 |
|
| |||
| затруб (Yeldar Azanbayev) | |||
| annulus valve: 15 phrases in 7 subjects |
| Drilling | 3 |
| Medical | 1 |
| Oil / petroleum | 3 |
| Oil and gas | 1 |
| Oil and gas technology | 5 |
| Oilfields | 1 |
| Sakhalin | 1 |