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September 3, 1951 - December 26, 1986
September 24, 1951 - February 1, 1980
June 30, 1952 - September 18, 2009
January 4, 1954 - September 28, 1962
February 1, 1954 - February 8, 1974
April 2, 1956 - September 17, 2010
April 2, 1956 - December 28, 1984
April 1, 1963 - present
April 1, 1963 - December 31, 1982
May 4, 1964 - June 25, 1999
November 8, 1965 - present
June 27, 1966 - April 2, 1971
September 18, 1967 - March 23, 1973
July 15, 1968 - present
January 5, 1970 - present
March 30, 1970 - December 31, 1976
March 26, 1973 - present
July 7, 1975 - January 13, 1989
March 29, 1982 - March 20, 1987
June 26, 1983 - November 10, 1995
July 30, 1984 - January 15, 1993
March 23, 1987 - present
June 1, 1997 - October 3, 2003
July 5, 1999 - August 7, 2008