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AIzaSyB4mHJ5NPEv-XzF7P6NDYXjlkCWaeKw5bc
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1 ene 1795 año - 1795: Semaphore system (= flags on posts) took 2 min for 240 km, France.
Añadido al timeline:
A brief history: communication events
By
Anh Phan
12 sep 2022
0
0
172
fecha:
1 ene 1795 año
Ahora mismo
~ 231 years ago
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