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Technology 1920-1930

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  1. Technology 1920-1930 1921 robot, fax 1922 insulin, 3-D movie 1923 frozen foods 1924 loud speaker, spiral notebooks 1925 mechanical television 1926 liquid fueled rockets 1927 electronic television, Technicolor 1928 penicillin, woman's’ vote equal to mans’ vote Sources: http://inventors.about.com/od/timelines/a/twentieth.htm Saettler, P. (2004). The Evolution of American Educational Technology. Greenwich, CT: Information Age Publishing