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23h 50min, dec 31, 1859 y - Telegraphic Optical Systems (use of flags, or traffic lights)
Added to timeline:
jose luis herrera lozada
By
Luis Edko Herr
11 Oct 2017
0
0
460
Date:
23h 50min, dec 31, 1859 y
Now
~ 166 years ago
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