CALCULADORA, cilíndrica, Loga-Calculator Zurich, primera mitad del siglo XX. Otros - Técnica y náutica - Auctionet
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Zurich Slimline Calculator/World-Time Clock C3404 from The Premier Collection | Clocks & Watches | The Premier Collection | Rave On Promotional Products
File:Loga-Calculator cylindrical slide rule, Daemen-Schmid, Zürich - Ridai Museum of Modern Science, Tokyo - DSC07494.JPG - Wikimedia Commons
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