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1 jan 150 ano antes da era comum - Smoke signals used

Descrição:

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

Adicionado na linha do tempo:

Timeline of Communications

13 nov 2019

1

0

461

Data:

1 jan 150 ano antes da era comum

Agora

~ 2177 years ago

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