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In 1920, the first true hair dryer came on the market, but it was extremely large and heavy, and frequently overheated.
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the first washing machine ever made.
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The 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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the first refrigerator that was made in the 1920's
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It was invented by Henry Ford.The automoblie with the combustion was the most popular invention in the 1920s. This invention had started new jobs.
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Karel Capek, marks the first use of the word "robot" to describe an artificial person. Capek invented the term, basing it on the Czech word for "forced labor." The robots in Capek's play are not mechanical men made of metal; instead they are molded out of a chemical batter and they look exactly like humans. Each robot costs the equivalent of $150 and "can do the work of two-and-a-half human laborers," so that humans might be free to have "no other task, no other work, no other cares" than perfec
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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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The Bulldozer was invented by Engineer Benjamin Holt. He bulit a crawling tracter which he called the caterpillar. LaPlant-Choate Manufacturing Company had produced the first bulldozer in 1923.
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The first man to give hope to dreams of space travel is American Robert H. Goddard, who successfully launches the world's first liquid-fueled rocket at Auburn, Massachusetts, on March 16, 1926. The rocket traveled for 2.5 seconds at a speed of about 60 mph, reaching an altitude of 41 feet and landing 184 feet away. The rocket was 10 feet tall, constructed out of thin pipes, and was fueled by liquid oxygen and gasoline.
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The bread slicer was invented by Otto Frederick Rowedder he lived in Iowa he worked on it since 1912. He completed the machine that could successfully cut and wrap a loaf of bread.
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The iron lung is a device that allows a person to breathe when normal muscle control has been lost or when a person can’t control their breathing. It is like a medical ventilator. The iron lung was invented by Philip Drinker and Louis Agassiz Shaw.
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Schick traces its origins to the inventive U.S. Army Lieutenant Colonel Jacob Schick. On November 6, 1928, Colonel Jacob Schick patented the first electric razor.
