History & Evolution of Abacus - Mesopotamian - Egyptian - Greek - Roman - Inca - Chinese - Japanese
4:16
Different Types of Abacus - Chinese Suanpan - Japanese Soroban - Russian Schoty
39:47
The Abacus Presentation: History, Theory and Operation
7:13
SUMERIAN ABACUS | The History of Computers, Ep. 1
10:43
The Fascinating History of the Abacus
16:35
The Rosetta Stone and what it actually says with Ilona Regulski | Curator's Corner S7 Ep7
10:01
Roman Hand Abacus
13:02
History of Abacus & How Abacus Calculate Numbers By Mastermind Abacus
28:00