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9 janv. 1887 - Railroad Telegrph
Description:
Date:1887
inventor: Granville Woods
Purpose: To reduce risk of collisions by allowing trains to communicate
Ajouté au bande de temps:
4 sept. 2018
0
0
128
history
Date:
9 janv. 1887
Maintenaint
~ Il y a 137 ans
Les images: