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Image: DesktopMechanicalCalculators inProduction intheXIXCentury

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Original image(SVG file, nominally 1,000 × 500 pixels, file size: 69 KB)

Description: Graph showing the Desktop Mechanical Calculators in production during the XIXth century
Title: DesktopMechanicalCalculators inProduction intheXIXCentury
Credit: Own work
Author: Ezrdr
Usage Terms: Public domain
License: Public domain
Attribution Required?: No

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