
Crick and Watson's DNA Molecular Model
1953
1953
1885
1953
1871
1872
1948-1953
1920-1950
1940
1907
1878-1879
1879
1903
1934
1915-1918
circa 1897
1920-1925
1917
1872
1918-1920
1919
1942
1870
1901-1930
1936
1920-1950
1895-1904
1920-1950
1935
1880-1920
1890-1910
1880-1920
circa 1871
1898
1918
1903
1949
1875
1951-1953
1901-1910
1920
1920-1950
1890-1935
1936
1901-1930
1945
1945-1948
1880
1900-1920
1879
1775-1799 (original); 1900-1907 (model)