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22 agos 1947 anni - Promecio

Descrizione:

Se rellenó el último hueco, el correspondiente al elemento número 61 (promecio).

Aggiunto al nastro di tempo:

Historia de la Química

ByDaniel Martinez Alzate

21 feb 2019

0

0

759

Data:

22 agos 1947 anni

Adesso

~ 78 years ago

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