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| 13 May, 1952 |
4 April, 1957 |
15 May, 1952-27 – February, 1956 |
| 8 March, 1956 – 10 May, 1957 |
| 10 May, 1957 |
31 March, 1962 |
11 May, 1957 – 16 April, 1962 |
| 16 April, 1962 |
3 March, 1967 |
17 April, 1962 – 16 March, 1967 |
| 16 March, 1967 |
7 December, 1970 |
17 March, 1967 – 19 July, 1969 |
| 8 August, 1969 – 19 March, 1971 |
| 19 March, 1971 |
18 January, 1977 |
22 March, 1971 – 1 December, 1975 |
| 5 January, 1976 – 25 March, 1977 |
| 25 March, 1977 |
22 August, 1979 |
26 March, 1977 – 13 July, 1977 |
| 21 July, 1977 – 21 January, 1980 |
| 21 January, 1980 |
31 December, 1984 |
22 January, 1980 – 15 January,
1985 |
| 15 January, 1985 |
27 November, 1989 |
16 January, 1985 – 18 December,
1989 |
| 18 December, 1989 |
13 March, 1991 |
19 December, 1989 – 9 July, 1991 |
| 9 July, 1991 |
10 May, 1996 |
10 July, 1991 – 22 May, 1996 |
| 22 May, 1996 |
4 Dec., 1997 |
23 May, 1996 – 23 March, 1998
(FN) |
| 23 March, 1998, |
26 April, 1999 |
24 March, 1998 – 20 October, 1999
(FN) |
| 20 October, 1999 |
6 February, 2004 |
22 October, 1999 – 3 March, 2002 |
| 10 May, 2002 – 4 June, 2004 |
| 2 June, 2004 |
— |
4 June, 2004 – Till date |
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