time line

July 1, 1909

July 10, 1910

August 11, 1910

October 7, 1912

May 26, 1928

December 12, 1928

July 10, 1930

October 9, 1939

July 8, 1940

July 13, 1940

October 11, 1940

October 22, 1947

October 22, 1947

November 2, 1948

May 1, 1950

May 29, 1950

July 19, 1950

March 25, 1957

September 11, 1959

October 1, 1975

July 16, 1976

July 13, 1985

May 16, 1997

May 7, 2009