16 juill. 500 av. J.-C. - First chinese abacus.
Description:
an oblong frame with rows of wires or grooves along which beads are slid, used for calculating.you move metal or wooden balls on a rod to help keep track while counting.
Ajouté au bande de temps:
Date:
16 juill. 500 av. J.-C.
Maintenaint
~ Il y a 2528 ans