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4.2.3 1920s. 4.2.4 1930s. ... The timeline of historic inventions is a chronological list of particularly ... After the war they saw extensive development as home ...
1920 Jungle gym The jungle gym, also known as monkey bars or climbing frame, is a piece of playground equipment made of many pieces of thin material, such as metal pipe or, in more current playgrounds, rope, on which children can climb, hang, or sit.
1920 advertisement for the Thor electric washing machine. The Thor washing machine was the first electric clothes washer sold commercially in the United States. Produced by the Chicago-based Hurley Electric Laundry Equipment Company, the 1907 Thor is believed to be the first electrically powered washer ever manufactured, crediting Hurley as the inventor of the first automatic washing machine.
At first, the end of wartime production caused a brief but deep recession, the post–World War I recession of 1919–1920 and a sharp deflationary recession or depression in 1920–1921. Quickly, however, the economies of the U.S. and Canada rebounded as returning soldiers re-entered the labor force and munitions factories were retooled to ...
By 1920, 254,000 miles (408,800 km) of standard-gauge railroad track had been laid in the United States, all of it owned or controlled by seven organizations. [45] The need to synchronize train schedules and the inefficiencies introduced by every city having its own local time, also led to introduction of Standard time by railway managers in 1883.
Pages in category "20th-century inventions" The following 128 pages are in this category, out of 128 total. This list may not reflect recent changes. A.
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The 1920s (pronounced "nineteen-twenties" often shortened to the "' 20s" or the "Twenties") was a decade that began on January 1, 1920, and ended on December 31, 1929. . Primarily known for the economic boom that occurred in the Western World following the end of World War I (1914–1918), the decade is frequently referred to as the "Roaring Twenties" or the "Jazz Age" in America and Western ...