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9 март 1930 г. - Charles Lauritsen makes an x-ray machine with high voltage that contributes to radiation therapy.
Добавлено на ленту времени:
1st Nine Weeks Honor Project Chemistry
By
Ayanna
18 окт 2018
0
0
451
Дата:
9 март 1930 г.
Сейчас
~ 95 г назад
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