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Válvula : 506 phrases in 26 subjects |
| Accumulators | 1 |
| Agriculture | 7 |
| Astronautics | 1 |
| Chemistry | 10 |
| Coal | 7 |
| Commerce | 2 |
| Communications | 3 |
| Construction | 7 |
| Earth sciences | 81 |
| Electronics | 34 |
| Energy industry | 1 |
| Environment | 2 |
| Forestry | 7 |
| General | 3 |
| Industry | 9 |
| Information technology | 5 |
| Labor law | 3 |
| Life sciences | 1 |
| Materials science | 18 |
| Mechanic engineering | 198 |
| Medical | 4 |
| Metallurgy | 8 |
| Mineral products | 1 |
| Power electronics | 14 |
| Scientific | 1 |
| Transport | 78 |
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