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Image: Gears used in Pascal's calculator
![Gears used in Pascal's calculator](/images/thumb/2/2c/Gears_used_in_Pascal%27s_calculator.jpg/800px-Gears_used_in_Pascal%27s_calculator.jpg)
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Description: Detail of
Title: Gears used in Pascal's calculator
Credit: Oeuvres de Blaise Pascal, Chez Detune, La Haye
Author: unknown, printed in 1779
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
Image usage
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