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jan 1, 1200 - Suan-Pan Abacus

Description:

A Chinese abacus[1] used for performing basic number calculations.

[1] https://www.ee.ryerson.ca/~elf/abacus/history.html

Added to timeline:

history of computing hardware

2 Mar 2021

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Date:

jan 1, 1200

Now

~ 826 years ago

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