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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