Which product design innovation was specifically created to solve a problem identified by its inventor while watching his sister struggle with household chores in 1908?

Throughout history, certain product designs have revolutionized industries and changed how we live. These innovations weren't just about aesthetics but solved fundamental problems through ingenious design thinking. Test your knowledge about pivotal moments in product design history that led to groundbreaking inventions and discoveries.

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• The Hoover vacuum cleaner with its innovative 'beating, sweeping, suction' mechanism
• The Singer sewing machine with its lock-stitch mechanism
• The Maytag washing machine with its agitator technology
• The KitchenAid stand mixer with its planetary mixing action

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