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It was invented by a women in Germany. She inserted a hose into the exhaust of a vacuum cleaner.
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It was invented by an engineer by the name of Benjamin Holt. He built a crawling tractor, which he called the caterpillar. The first manufactured bulldozer was produced in 1923.
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The traffic light was invented by police officer William Potts. He used red, amber and green lifhts and $37 worth of wire to make his traffic lights
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Invented by Henry Ford and was the most popular invention in the 1920's. This inventions provided jobs for many people.
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The first radio broadcast happened in Pittsburgh, Pennsylvania
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Invented by Charles Perkins Strite. It can also be used for pop tarts.
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Invented by a medical student in Californa, John A. Larson.
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The first public 3-D movie was produced. The movie was called, "The Power of Love."
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Kool-Aid was invented by Edwin Perkins from Omaha, Nebraska. It was originally called Fruit Smack
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It was invented by Otto Frederick Rowedder. It could successfully cut and wrap a loaf of bread.
