Timeline of 1900's By 09185 Period: Jan 1, 1900 to Jan 1, 1990 Inventions Jun 9, 1901 vacuum cleaner Feb 7, 1902 air conditioning; automated tea maker Feb 4, 1903 electrocardiogram; first powered flight Mar 5, 1904 radar; tea bags; diodes Sep 21, 1905 plastic; windscreen wipers; silencer for guns Feb 28, 1906 radio broadcasting Oct 3, 1907 electric washing machine Apr 7, 1908 coffee filter; water coolers; paper cups; assembly line production May 24, 1910 neon lamps Jan 6, 1911 stenotype machines Feb 4, 1913 Ecstasy; Brillo pads; crossword puzzles; bras; zips Feb 4, 1916 sonar Feb 4, 1920 hair dryers; kiss-proof lipstick; submachine guns Feb 4, 1921 robots; insulin Feb 4, 1922 Aga cooker Feb 4, 1923 hearing aids Feb 4, 1924 frozen food Feb 4, 1925 Geiger counter; television Feb 4, 1926 liquid fuel rocket; pop-up toaster; aerosol sprays Feb 4, 1927 ‘Talkies’ at the movies Feb 4, 1928 iron lung; penicillin Dec 1, 1929 artificial life Jan 1, 1930 jet engine; mechanical toothbrushes; Scotch tape