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101 Inventions That Changed the World in the Last 100 Years
granted to Francis Robbins Upton 1890, while the electrical heat detector was patented by George Andrew Darby in 1902. In 1951, large and costly smoke detectors were first sold in the United States, but
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Top 101 Black Inventors & African American's Best Invention Ideas that Changed The World
RELATED: Top 100 Famous Female Inventors in History & Modern Women Inventors 6. Andrew J. Beard (1849 – 1921) – Jenny coupler Andrew Beard was born into slavery but became one of the country’s most brilliant
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