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Terms for subject Firefighting and fire-control systems containing unseen | all forms | exact matches only
| English | Russian |
| unseen spread of fire and smoke in cavities | скрытое распространение огня и дыма по пустотам (yevsey) |
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| English | Russian |
| unseen spread of fire and smoke in cavities | скрытое распространение огня и дыма по пустотам (yevsey) |