![](http://www.alamy.com/thumbs/6/14BEB3ED-9F1F-4E09-AC4D-04F8B59D0854/DH42A9.jpg)
Rechenschieber, Abakus mit bunten Kugeln
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Photo credit: © TPH / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: blue, calculating, calculator, childhood, colorful, concept, education, mathematics, symbol, white, wood, yellow