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jan 3, 1907 - Раунд Х.Д.Создание светодиодной лампы
Added to timeline:
История создания ламп (накаливания, люминисцентных, светодиодных)
By
Анна
12 Dec 2017
1
0
952
Date:
jan 3, 1907
Now
~ 119 years ago
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