File:17th-century-mechanical-calculators -Detail.jpg
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![File:17th-century-mechanical-calculators -Detail.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/6/68/17th-century-mechanical-calculators_-Detail.jpg/799px-17th-century-mechanical-calculators_-Detail.jpg)
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 12:01, 11 March 2012 | ![]() | 975 × 288 (90 KB) | commons>Ezrdr |
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