 |
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| ventilation system of the naturally driven type (Julchonok); natural ventilator (Ulkina) | |||
| вентиляция с естественным побуждением: 4 phrases in 3 subjects |
| Firefighting and fire-control systems | 2 |
| Sakhalin | 1 |
| Technology | 1 |
|
| |||
| ventilation system of the naturally driven type (Julchonok); natural ventilator (Ulkina) | |||
| вентиляция с естественным побуждением: 4 phrases in 3 subjects |
| Firefighting and fire-control systems | 2 |
| Sakhalin | 1 |
| Technology | 1 |