 |
| |||
| concave bit; concave crown | |||
| долото с вогнутой рабочей поверхностью: 3 phrases in 2 subjects |
| Oil / petroleum | 2 |
| Oil and gas technology | 1 |
|
| |||
| concave bit; concave crown | |||
| долото с вогнутой рабочей поверхностью: 3 phrases in 2 subjects |
| Oil / petroleum | 2 |
| Oil and gas technology | 1 |