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| плоский змеевик (нагревателя в резервуаре) | |||
| плоская спираль | |||
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flat spiral : 6 phrases in 5 subjects |
| Electronics | 2 |
| Makarov | 1 |
| Mechanic engineering | 1 |
| Metallurgy | 1 |
| Mining | 1 |
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