Japanese Abacus (1 jan 1400 ano – 14 h 49 m, 1 jul 2019 ano)
Descrição:
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.Adicionado na linha do tempo:
Data:
1 jan 1400 ano
14 h 49 m, 1 jul 2019 ano
~ 619 years