1 jan 1100 ano antes da era comum - Abacus

Descrição:

This ancient device was used for counting.

Computer. (2018). In Encyclopædia Britannica. Retrieved from https://academic-eb-com.ezproxy.umary.edu/levels/collegiate/article/computer/117728#216021.toc

Amazon. [Image]. On Amazon. Retrieved from https://www.amazon.com/Lowpricenice-Plastic-Arithmetic-Soroban-Calculating/dp/B00A0ETB2E.

Adicionado na linha do tempo:

Data:

Imagens: