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AIzaSyB4mHJ5NPEv-XzF7P6NDYXjlkCWaeKw5bc
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20 feb 150 año aC - SMOKE SIGNAL

Descripción:

The earliest form of long distance communication. Greek historian, Polybius, developed a system of alphabetical smoke signals by holding sets of torches in pairs.

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Technology Change over the Years

ByOlivia Xiao
26 nov 2018
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fecha:

20 feb 150 año aC
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~ 2177 years ago
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