11 set 3001 ano antes da era comum - Abacus
Descrição:
The Abacus was used in Babylon 2000 years before the Greeks used it to help with calculating. To use it, you slide the beads up and down on the rods to add and subtract. It is used today in some countries.
Adicionado na linha do tempo:
Rohan's Lit Timeline
About the advancement of computers
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