Which groundbreaking 20th century invention was initially marketed as a medical device called the 'Electrical Negative Gravitizer' before finding mainstream success under a different name and purpose?

Throughout history, some of the world's most important inventions faced significant marketing challenges before achieving widespread adoption. The journey from laboratory to mainstream use often hinged on innovative brand storytelling that helped the public understand unfamiliar technologies. Test your knowledge about how certain revolutionary products were first introduced to skeptical consumers and how their marketing shaped our perception of these innovations.

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The vibrating massage belt
The trampoline
The electric toothbrush
The hair dryer