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| двухкратная схема | |||
| схема двухтактного удвоителя частоты | |||
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push-push circuit : 23 phrases in 9 subjects |
| Astronautics | 1 |
| Electrical engineering | 7 |
| Electronics | 3 |
| Mass media | 1 |
| Radioengineering | 1 |
| Technology | 4 |
| Telecommunications | 2 |
| Telegraphy | 2 |
| Telephony | 2 |