16 Jul 500 Jahr v. Chr. - First chinese abacus.
Beschreibung:
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.
Zugefügt zum Band der Zeit:
Datum:
16 Jul 500 Jahr v. Chr.
Jetzt
~ 2528 years ago