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The air dryer was invented a a girl in germany who attached a hose to a vacuum cleaner
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Leo Gerstenzag had took his wife invention and put it on the market. It was called Baby Gays at first. In 1926, he changed the name to Q-Tips® Baby Gays. The Q stand for quality.
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The first four-way, three-color traffic light was invented by police officer William Potts. He used red, amber and green lights and $37 worth of wire to make his traffic light
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John A. Larson was the inventer of the lie detector test. He was a medical student when he invented the test in Califorina.
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Earle Dickson created the band aid for his wife because Josephine DIckson was cutting herself every day.
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The Bulldozer was invented by Engineer Benjamin Holt. It was a crawling tracter which he called the caterpillar. LaPlant-Choate Manufacturing Company had produced the first bulldozer.
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The first flight of a liquid-propellant rocket took place at Auburn, Massachusetts, when American professor Dr. Robert H. Goddard launched a vehicle using liquid oxygen and gasoline as propellants.
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Kool-Aid was invented by Edwin Perkins of Omaha, Nebraska. The original name was called Fruit Smack.
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The bread slicer was invented by Otto Frederick Rowedder he was living in Iowa and he worked on it every since 1912.
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