Japanese Abacus (1 янв 1400 г. – 14 ч 49 мин, 1 июл 2019 г.)
Описание:
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.Добавлено на ленту времени:
Дата:
1 янв 1400 г.
14 ч 49 мин, 1 июл 2019 г.
~ 619 years
