Проводники и дарбука
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![Проводники, полупроводники и непроводники [Радиолюбитель TV 3]](https://sun9-47.userapi.com/ylobqBh-jMl2FQt0qHC8dVsuUeMQxCbeUjtXFQ/xLurN4Z-Ea0.jpg)
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