Abacus (8 ч 3 мин, 6 авг 1300 г. – 6 ч 48 мин, 30 ноя 1300 г.)
Описание:
It was a counting frame that they used in Europe . It was created in 500 B.C. but wasn't used till 1300 A.D. Image: https://www.google.com/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&ved=0ahUKEwiuro6KrfjWAhXFy4MKHT77AvsQjRwIBw&url=https%3A%2F%2Fen.wikipedia.org%2Fwiki%2FAbacus&psig=AOvVaw3wknx-Z7o60cKC8nn8QKjC&ust=1508353571396909Добавлено на ленту времени:
Дата:
8 ч 3 мин, 6 авг 1300 г.
6 ч 48 мин, 30 ноя 1300 г.
~ 3 months and 26 days