jan 1, 300 BC - Abacus (300 B.C.-1200 A.D.)
Description:
The abacus is a device that dates back from 300 B.C.-1200 A.D. , it has beads/disks that can move up or down in order to help people what they’re calculating.Added to timeline:
Date:
jan 1, 300 BC
Now
~ 2327 years ago