![](http://www.alamy.com/thumbs/6/329F59B6-26FA-4E1D-9707-90C74835D913/AYPMC8.jpg)
Counter balls give a count by sliding on the rods of abacus
Size: 6373px × 4249px
Photo credit: © AllrightImages / Alamy / Afripics
License: Royalty Free
Model Released: No
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