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6 sett 150 anni a. C. - Polybius, a greek historian created a complex alphabetical smoke signals by holding two torches in a particular position

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Roshan communication timeline

ByRoshan Devulapally

26 giu 2019

1

1

371

Data:

6 sett 150 anni a. C.

Adesso

~ 2177 years ago

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