| |||
| cilindro de aire | |||
| motor autorrefrigerado; motor de aire caliente; motor neumático | |||
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air engine : 24 phrases in 9 subjects |
| Coal | 1 |
| Earth sciences | 1 |
| General | 3 |
| Life sciences | 1 |
| Mechanic engineering | 6 |
| Natural sciences | 1 |
| Patents | 1 |
| Technology | 8 |
| Transport | 2 |