Which of these product innovations was initially rejected by its inventor's own company because they believed it had 'no practical commercial application'?

Throughout history, certain product innovations have fundamentally changed how we live, work, and interact with the world. These groundbreaking inventions often began as solutions to specific problems but evolved to reshape entire industries and consumer behaviors. Test your knowledge about these game-changing product innovations that transformed markets and created entirely new consumer categories.

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• The Post-it Note (3M)
• The iPhone (Apple)
• WD-40 lubricant (Rocket Chemical Company)
• Gore-Tex fabric (W.L. Gore & Associates)

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