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File:17th-century-mechanical-calculators.jpg

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English: 17th century mechanical calculators by Blais Pascale in the french Musée des Arts et Métiers, Paris
Български: Механичните калкулатори на Блез Паскал от 17в. в Музея на изкуствата и занаятите, Париж
Date 17 August 2010
Source Own work
Author Edal Anton Lefterov

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