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21h 3min, jan 1, 1820 y - Датский учёный, физик Ганс Кристиан Эрстед продемонстрировал, что провод с током отклоняет намагниченную стрелку компаса

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История развития радио

ByВладимир
3 Dec 2017
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21h 3min, jan 1, 1820 y
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~ 205 years ago

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