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7 ч 25 мин, 2 янв 1919 г. - Francis Aston pioneers the mass spectrometer and uses it to discover many isotopes

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20th Century

ByRafelle Marie Timog Allego
10 фев 2018

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7 ч 25 мин, 2 янв 1919 г.
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~ 105 г назад
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