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10 apr 1790 anni - 19. US! Patent system created
Descrizione:
United States Patent system is established for the first time.
Aggiunto al nastro di tempo:
French Revolution
By
Scarlette Fox
12 feb 2018
0
0
303
Data:
10 apr 1790 anni
Adesso
~ 234 years ago
Immagini:
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