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Top 101 Black Inventors & African American's Best Invention Ideas that Changed The World
Davidson invented a paper rewinding device for adding-machine in 1908 and an automatic fee device in 1911. Both inventions made his job much easier and more efficient. RELATED: How to Succeed as an Inventor:
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Top 101 Female Inventions that Changed the World & Women’s Innovation History
Physics with Henri Becquerel for their separate work on radioactivity. She won another Nobel Prize in 1911 for chemistry, developing a way to measure radioactivity. She also supervised the establishment of
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100 Famous Inventors and Their Best Invention Ideas
vehicle the S-1. More models soon followed, including the S-2, S-3, and S-4, with minor improvements. In 1911, using the S-5 equipped with 50 horsepower, he could fly for more than 60 minutes and reach an altitude