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jan 1, 1895 - He
Description:
Гелий
открыли Уильям Рамзай и Уильям Крукс
Added to timeline:
12 Nov 2018
0
0
453
Chemical timeline
открытие химических элементов
Date:
jan 1, 1895
Now
~ 129 years ago
Images:
Geo:
