Japanese Abacus (jan 1, 1400 – 14h 49min, jul 1, 2019 y)
Description:
The Japanese Abacus can also be called a soroban. It is conceived from the ancient Chinese suanpan, which was imported to Japan in the 14th century. It has 4 beads at the bottom and one at the top and the number of rods in a soroban is always odd and never fewer than nine.
Added to timeline:
Date:
jan 1, 1400
14h 49min, jul 1, 2019 y
~ 619 years