Which mathematical instrument was originally packaged and sold in a distinctive cylindrical leather case with the inventor's name embossed in gold, becoming a status symbol among engineers in the 1920s?

Before digital calculators and computers revolutionized mathematics, various tools and instruments helped mathematicians, engineers, and scientists perform calculations. These products played crucial roles in advancing mathematical knowledge and applications. Test your knowledge about the history and packaging of these mathematical instruments that shaped our computational past!

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Curta mechanical calculator
Brunsviga arithmometer
Keuffel & Esser slide rule
Otis King's cylindrical slide rule