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Señanles visuales de largo alcance: Sistemas semaforo (1870-1875) (may 8, 1870 – sep 8, 1875)
Added to timeline:
Historia de los teléfonos
By
Luis Miguel Serna Durango
21 Oct 2017
0
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435
Date:
may 8, 1870
sep 8, 1875
~ 5 years and 4 months
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