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Abacus was Invented (1 gen 2700 anni a. C. – 1 gen 2300 anni a. C.)

Descrizione:

-A calculating tool that could do simple math
-First used by Babylonians, Chinese, and Egyptians

Aggiunto al nastro di tempo:

Data:

1 gen 2700 anni a. C.
1 gen 2300 anni a. C.
~ 400 years