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hair dryer
The Hair Dryer was invented in Gremany. By this women who had insert a hose in the exhaust of a vacuum cleaner. -
traffic light
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 -
car
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. -
band aid
The Band-Aid was invented by a man called Earle Dickson. The reason why he invented the band-aid because his wife Josephine Dickson be cutting herself every day. -
first radio broadcast
The radio station KDKA was the first station in America to own a license and broadcast on radio on November 2nd, 1920. -
lie detector
The lie detector test was invented by a man named James McKenzie, a medical student named John Larson from the University of California invented the modern polygraph instrument, which was much more accurate in its results than the previous machine. -
bulldozer
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. -
Automatic watch
the first self-winding, or automatic, wristwatch was the invention of a British watch repairer named John Harwood in 1923. -
masking tape
Masking tape was invented in 1925 by 3M employee Richard Drew. Drew observed autobody workers growing frustrated when they removed butcher paper they had taped to cars they were painting. The strong adhesive on the tape peeled off some of the paint they had just applied. -
penicillin
it was not until 1928 that penicillin, the first true antibiotic, was discovered by Alexander Fleming, Professor of Bacteriology at St. Mary's Hospital in London.