| |||
| ударно-режущее буровое долото (MichaelBurov) | |||
|
percussion- drag bit : 2 phrases in 2 subjects |
| Oil and gas technology | 1 |
| Oilfields | 1 |
| |||
| ударно-режущее буровое долото (MichaelBurov) | |||
|
percussion- drag bit : 2 phrases in 2 subjects |
| Oil and gas technology | 1 |
| Oilfields | 1 |