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| дыхательная маска | |||
| противогаз; предохранительная маска | |||
| маска для дыхания | |||
| респиратор | |||
| breathing mask: 10 phrases in 8 subjects |
| Aviation | 1 |
| Aviation medicine | 1 |
| Construction | 2 |
| General | 1 |
| Military | 1 |
| Security systems | 1 |
| Technology | 2 |
| Weapons of mass destruction | 1 |