Which groundbreaking invention first popularized the 'razor and blades' subscription business model, where the main product was sold cheaply while creating recurring revenue through consumable components?

In today's digital economy, subscription models have revolutionized how we consume products and services. But the concept of subscription-based business models didn't begin with Netflix or Spotify. The history of subscription services dates back centuries and has evolved dramatically with technological advancement. This poll tests your knowledge about a pivotal moment in subscription model history that changed how inventions and discoveries reach consumers.

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Gillette's safety razor (1904)
Eastman Kodak's Brownie camera (1900)
Edison's phonograph (1877)
Singer sewing machine (1851)