 |
| |||
| parallel line pen; parallel-line pen | |||
| двойное перо: 6 phrases in 6 subjects |
| Dentistry | 1 |
| Drilling | 1 |
| Mining | 1 |
| Oil / petroleum | 1 |
| Oil and gas | 1 |
| Oil and gas technology | 1 |
|
| |||
| parallel line pen; parallel-line pen | |||
| двойное перо: 6 phrases in 6 subjects |
| Dentistry | 1 |
| Drilling | 1 |
| Mining | 1 |
| Oil / petroleum | 1 |
| Oil and gas | 1 |
| Oil and gas technology | 1 |