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jan 1, 2000 BC - The Abacus

Description:

This is hand operated mechanical calculator using beads on rods, first used by Sumerians and Egyptians around 2000 BC.

Added to timeline:

The Calculator

13 Sep 2017

0

0

676

Date:

jan 1, 2000 BC

Now

~ 4028 years ago

Images:

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