Which inventor famously used a 'razor and blades' pricing strategy, giving away the base product at cost or below while making profits on required consumables?

Throughout history, groundbreaking inventions have not only changed our world technologically but also introduced innovative pricing strategies that revolutionized how products reach consumers. From Edison's lightbulb subscription model to Bell's telephone rental system, pricing innovations have been crucial to the adoption and commercialization of major discoveries. Test your knowledge about the fascinating intersection of world-changing inventions and the pricing strategies that helped them conquer markets!

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King C. Gillette (Gillette safety razor)
Thomas Edison (phonograph)
George Eastman (Kodak camera)
Alexander Graham Bell (telephone)