 |
| |||
| indirekte Beheizung | |||
| indirektes Wärmen; mittelbare Heizung | |||
| indirektes Erhitzen (separate furnace for heating heat-carrying media which are injected into the oil shale) | |||
| indirect heating: 12 phrases in 6 subjects |
| Chemistry | 2 |
| Electronics | 5 |
| Industry | 1 |
| Natural resourses and wildlife conservation | 1 |
| Technology | 2 |
| Thermal Energy | 1 |