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22 août 1947 - Promecio
Description:
Se rellenó el último hueco, el correspondiente al elemento número 61 (promecio).
Ajouté au bande de temps:
Historia de la Química
By
Daniel Martinez Alzate
21 févr. 2019
0
0
760
Date:
22 août 1947
Maintenaint
~ Il y a 78 ans
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