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| pressure-differential meter: 16 phrases in 9 subjects |
| Firefighting and fire-control systems | 1 |
| Hydrology | 1 |
| Makarov | 3 |
| Measuring instruments | 4 |
| Military | 1 |
| Nautical | 1 |
| Oil / petroleum | 1 |
| Technology | 3 |
| Thermal engineering | 1 |
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