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(Improved (cleanup, colors, transparency...) from https://en.wikipedia.org/wiki/HP-19B#/media/File:HP-19BII_Business_Consultant_II,_Financial_Calculator_from_Hewlett-Packard_(changed_to_plan_view,_improved_colours).jpg Original author: "J. C. Barros", and "Pittigrilli" License: CC BY 2.0) |
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