Encyclopedia > 1920s

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1920s

Centuries: 19th century - 20th century - 21st century

Decades: 1870s 1880s 1890s 1900s 1910s - 1920s - 1930s 1940s 1950s 1960s 1970s

Years: 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929


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Dynabee

... will also be accelerated to a smaller extent by the slipping friction. The device is covered by US patents 3,726,146 (1973) and 5,353,655 (1994) by L.A. Mishler and ...

 
 
 
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