Abacus 2
by Firkin - uploaded on September 3, 2016, 1:15 pm
The counting machine of old. From a public domain drawing on Wikimedia Commons
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- Tags
- abacus count counting counting frame frame mathematics
- Safe for Work?
- Yes
by Firkin - uploaded on September 3, 2016, 1:15 pm
The counting machine of old. From a public domain drawing on Wikimedia Commons
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