Which retail strategy was famously used by Keuffel & Esser (K&E), one of the leading slide rule manufacturers, to dominate the American market in the 1950s-60s?

Before calculators became ubiquitous, the slide rule was the essential tool for mathematical calculations. This trivia question explores the fascinating retail history of this iconic mathematical instrument that transformed education, engineering, and scientific progress throughout much of the 20th century. Test your knowledge about how this computational device was marketed and sold during its heyday!

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University bookstore exclusivity deals that prevented competitors from selling in campus stores
Free slide rule workshops in department stores with minimum purchase requirements
Monthly subscription model where customers received updated slide rule components
Celebrity mathematician endorsements featuring prominent NASA engineers