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10 jan 2500 ano antes da era comum - Abacus (2700-2300 B.C.) The Abacus was an early calculating tool. It worked by shifting balls along a pole of metal.

Adicionado na linha do tempo:

Robert Asztalos - Calculator Timeline

20 out 2017

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647

Data:

10 jan 2500 ano antes da era comum

Agora

~ 4528 years ago

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