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First known Abacus (jan 15, 2700 BC – oct 11, 2300 BC)
Description:
Made from the early Babylonians
Added to timeline:
I.C.T. growth over the centuries
By
Babis Kinigopoulos
29 Feb 2020
0
0
259
Date:
jan 15, 2700 BC
oct 11, 2300 BC
~ 399 years
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