 |
| |||
| flue, smoke stack; cone raise | |||
| ventilating shaft | |||
| cheminée d 'évacuation: 9 phrases in 7 subjects |
| Chemistry | 1 |
| Coal | 1 |
| Construction | 1 |
| Environment | 1 |
| Metallurgy | 1 |
| Natural resourses and wildlife conservation | 2 |
| Ventilation | 2 |
|
| |||
| flue, smoke stack; cone raise | |||
| ventilating shaft | |||
| cheminée d 'évacuation: 9 phrases in 7 subjects |
| Chemistry | 1 |
| Coal | 1 |
| Construction | 1 |
| Environment | 1 |
| Metallurgy | 1 |
| Natural resourses and wildlife conservation | 2 |
| Ventilation | 2 |