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| входной конец трубы | |||
| pipe mouth: 9 phrases in 9 subjects |
| Automobiles | 1 |
| Construction | 1 |
| Firefighting and fire-control systems | 1 |
| Metallurgy | 1 |
| Oil / petroleum | 1 |
| Pipelines | 1 |
| Rail transport | 1 |
| Technology | 1 |
| Thermal engineering | 1 |
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