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| фотоэлектрический элемент с внешним фотоэффектом; фотоэлектрический элемент | |||
| фотоэлемент | |||
| fototubo: 4 phrases in 3 subjects |
| Antennas and waveguides | 1 |
| Military | 1 |
| Technology | 2 |
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