
Crick and Watson's DNA Molecular Model
1953
1953
1953
1934
1949
1920-1950
1901-1930
1919
1918
1935
1915-1925
circa 1919
1903
1907
1953
1942
1948-1953
1945
1920-1950
1920-1950
1918-1920
1951
1916-1918
1905
1889
1943
1920-1950
1901-1920
1910-1920
1935
1920-1929
1903
1915-1918
1889
1934-1935
1920-1925
1896
1899-1919
1951-1953
1928
1901-1910
1921
1953
1945
1901-1930
1936
1929
1909-1910
1946-1950
1930-1939
1801-1840 (original); 1901 (model)