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1 gen 150 anni a. C. - Smoke signals used

Descrizione:

Greek historian Polybius develops a complex system of alphabetical signals sent by holding sets of torches in pairs

Aggiunto al nastro di tempo:

Timeline of Communications

13 nov 2019

1

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461

Data:

1 gen 150 anni a. C.

Adesso

~ 2177 years ago

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