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Image: 17th-century-mechanical-calculators -Detail
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Description: 17th century mechanical calculators
Title: 17th-century-mechanical-calculators -Detail
Credit: File:17th-century-mechanical-calculators.jpg
Author: Edal Anton Lefterov
Usage Terms: Creative Commons Attribution-Share Alike 3.0
License: CC BY-SA 3.0
License Link: https://creativecommons.org/licenses/by-sa/3.0
Attribution Required?: Yes
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