Which invention's marketing campaign was revolutionized when its creator sent free samples to all members of the US Congress in 1906, causing a national sensation and transforming the product into a household name?

Before social media dominated marketing, certain product launches changed the game with groundbreaking marketing approaches. These campaigns not only sold products but fundamentally altered how companies connect with consumers. This trivia question explores one of history's most influential product marketing campaigns that transformed an invention from obscure to iconic through unconventional promotion strategies.

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Gillette safety razor
Kodak Brownie camera
Bell telephone
Singer sewing machine