The Roaring Twenties 1920-1929
The Roaring Twenties had many famous amazing inventions like; the first robot made in 1921, the first lie detector also invented in 1921 by John Larson, the first "self-winding" watch in 1923, the first car radio invented by american, Paul Galvin, and many more useful inventions.
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New technologies, especially automobiles, moving pictures and radio proliferated 'modernity' to a large part of the population. The automobile, movie, radio and chemical industries skyrocketed during the 1920's. Before the war, cars were a luxury. In the 1920s, mass-produced vehicles became common throughout the U.S. and Canada. By 1927, Ford discontinued the Model T after 15 million of the model. About 300 000 vehicles were registered in 1918 in all of Canada, but by 1929, there were 1.9 million, and automobile parts were being made in parts of Ontario.
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Radio became the first mass broadcasting medium. Radios were expensive, but their mode of entertainment proved revolutionary. During the "golden age of radio", radio programming was as varied as TV programming today. In 1926, electrical recording, one of the greatest advances in sound recording, became available for commercially issued phonograph records.