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Tenure
January 26 1950 to November 6 1951
November 7 1951 to January 3 1954
January 4 1954 to December 22 1954
December 23 1954 to January 31 1956
February 1 1956 to September 30 1959
October 1 1959 to January 31 1964
February 1 1964 to March 15 1966
March 16 1966 to June 29 1966
June 30 1966 to April 11 1967
April 12 1967 to February 24 1968
February 25 1968 to December 16 1970
December 17 1971 to January 21 1971
January 22 1971 to April 25 1973
April 26 1973 to January 28 1977
January 29 1977 to February 21 1978
February 22 1978 to July 11 1985
July 12 1985 to December 20 1986
December 21 1986 to June 18 1989
June 19 1989 to December 17 1989
December 18 1989 to September 25 1990
September 26 1990 to November 24 1991
November 25 1991 to December 12 1991
December 13 1991 to November 17 1992
November 18 1992 to February 11 1993
February 12 1993 October 24 1994
October 25 1994 to March 24 1997
March 25 1997 to January 17 1998
January 18 1998 to October 9 1998
October 10 1998 to October 31 2001
November 1 2001 to May 5 2002
May 6 2002 to November 8 2002
November 8 2002 to 18 December 2002
December 19 2002 to May 2 2004
May 2 2004 to June 1 2004
June 1 2004 to November 1 2005
November 1 2005 to January 14 2007
January 14 2007 to May 12 2010
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