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cap valve : 55 phrases in 9 subjects |
| Automobiles | 17 |
| Compressors | 2 |
| Cycle sport | 1 |
| Drilling | 6 |
| Hydroelectric power stations | 1 |
| Materials science | 1 |
| Rail transport | 4 |
| Shipbuilding | 1 |
| Technology | 22 |
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