Image: Detail of a Roth Calculating machine
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Description: Detail of an early calculating machine invented by Didier Roth around 1840. This machine is a direct descendant of Pascal's Calculator.
Title: Detail of a Roth Calculating machine
Credit: Own work
Author: Ezrdr
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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