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7 St. 25 Min, 2 Jan 1919 Jahr - Francis Aston pioneers the mass spectrometer and uses it to discover many isotopes
Zugefügt zum Band der Zeit:
20th Century
By
Rafelle Marie Timog Allego
10 Feb 2018
0
0
653
Datum:
7 St. 25 Min, 2 Jan 1919 Jahr
Jetzt
~ 105 years ago
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