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| кольцевой фильтр | |||
| ring filter: 18 phrases in 9 subjects |
| Antennas and waveguides | 5 |
| Food industry | 3 |
| Household appliances | 1 |
| Makarov | 2 |
| Mathematics | 1 |
| Technology | 2 |
| Telecommunications | 1 |
| Textile industry | 1 |
| Transport | 2 |
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