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20th-century patents
This is a timeline of the 20th century.
Topics
- Sports in the 20th century
- Nature in the 20th century
- Science in the 20th century
- Museum van de 20ste Eeuw, Hoorn
- Maps showing 20th-century history
- Languages in the 20th century
- History of environmentalism
- Baranya Megyei SZC Radnóti Miklós Közgazdasági Technikum
- Catálogo de imagens de santos
- 20th-century patents
- 20th-century developments
- 20th-century art
- 20th century in mass media
- 20th century by year
- 20th century in Armenia
- 20th century by topic
- 20th century by country
- 20th century by decade
- 20th century by continent
- Welfare
- Technology and Design
- 2nd millennium AD
- 20th century
- 2nd Millennium BC
- 1959
- 1962
- 1995
- 1917
- 1912
- 1924
- 1929
- 1971
- 1921
- 1925
- 1931
- 1936
- 1938
- 1932
- 1949
- 1943
- 1945
- 1942
- 1948
- 1928
- 1947
- 1926
- 1952
- 1923
- 1954
- 1920
- 1961
- 1904
- 1900
- 1905
- 1906
- 1902
- 1915
- 1913
- 1911
- 1918
- 1916
- 1919
- 1910
- 1934
- 1914
- 1922
- 1927
- 1933
- 1939