Which of these famous mathematical products was first marketed as the 'Merchants' Key' and featured advertising claiming it could 'perform the mental labor of business arithmetic'?

Before digital calculators and computers, mathematicians and engineers relied on various physical tools to perform calculations. These famous products revolutionized computation and mathematical analysis in their time. Test your knowledge about these historically significant mathematical tools that shaped the way calculations were performed before the digital age!

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• The Curta Calculator (pocket mechanical calculator)
• The Comptometer (key-driven mechanical calculator)
• Napier's Bones (multiplication aid)
• The K&E Slide Rule (logarithmic calculation device)

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