![File:Leibniz Stepped Reckoner.png](http://up.wiki.x.io/wikipedia/commons/thumb/b/b8/Leibniz_Stepped_Reckoner.png/800px-Leibniz_Stepped_Reckoner.png)
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 12:48, 16 January 2008 | ![]() | 1,235 × 803 (213 KB) | Chetvorno | {{Information |Description=Photo of the ''Staffelwalze'' (English: 'Stepped Reckoner') a prototype mechanical calculator invented by German mathematician Gottfried von Leibniz in 1674. Thi |
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