Image: 19th-and-early-20th-centuries-calculating-machines
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Description: 19th and early 20th centuries calculating machines from Musée des Arts et Métiers, Paris, France
Title: 19th-and-early-20th-centuries-calculating-machines
Credit: Own work
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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