| SI.No |
Approval letter No. with date |
Year |
| 1 |
G.O. Ms No. 1764 Dated 8-11-1984 |
1984 -1988 |
| 2 |
G.O. Ms No. 1278 Dated 14-09-1989 |
1989-1993 |
| 3 |
No. F 730-52-101(E)/ET/96 |
1994-1995 |
| 4 |
No. Fo 15-51-E111/RC/MB/93/14369 Dated 21-01-1994 |
1995-1996 |
| 5 |
F No 418 / GEN / E&T / 98 / DATED 22-01-1999 |
1997-1999 |
| 6 |
F NO 730 - 52 - 101(E) / ET/97 DATED 14-09-2000 |
2000-2003 |
| 7 |
F NO 730 - 52 - 101(E) / ET/97 DATED 23-08-2001 |
2001-2002 |
| 8 |
FILE NO TTD 182 /2002/SRO DATED 31-07-2000 |
2002-2003 |
| 9 |
F NO TTD - 179 / 2003/SRO/7515 DATED 2-07-2003 |
2003-2004 |
| 10 |
F NO TN-89-178 / DIP / 2004 /5186 DATED 5-06-2004 |
2004-2006 |
| 11 |
F NO TN-89-178 / DIP / 2006 /7693 DATED 10-07-2006 |
2006-2007 |
| 12 |
F NO TN-89-178 / DIP / 2007 /8637 DATED 13-07-2007 |
2007-2012 |
| 13 |
TN-89-178/DIP/2008/7496 09-06-2008 |
2008-2009 |
| 14 |
TN-89-178/DIP/2009/2707 24-06-2009 |
2009-2010 |
| 15 |
TN-89-178/DIP/2009/6653 19-08-2010 |
2010-2011 |
| 16 |
Southern / 1-451838221 / 2011 / EOA 01-09-2011 |
2011-2012 |
| 17 |
Southern / 1-707669094 / 2012 / EOA 10-05-2012 |
2012-2013 |
| 18 |
Southern / 1-1449968722 / 2013 / EOA 19-03-2013 |
2013-2014 |
| 19 |
Southern / 1-2017211147 / 2014 / EOA 07-05-2014 |
2014-2015 |
| 20 |
Southern / 1-2456207278 / 2015 / EOA 07-04-2015 |
2015-2016 |
| 21 |
Southern / 1-2811301918 / 2016 / EOA 05-04-2016 |
2016-2017 |
| 22 |
Southern / 1-3325493335 / 2017 / EOA 30-04-2017 |
2017-2018 |
| 23 |
Southern / 1-3511200748 / 2018 / EOA 04-04-2018 |
2018-2019 |
| 24 |
Southern / 1-4260206564 / 2019 / EOA 10-04-2019 |
2019-2020 |
| 25 |
Southern / 1-7014055905 / 2020 / EOA 30-04-2020 |
2020-2021 |
| 26 |
Southern / 1-9318179624 / 2021 / EOA 25-06-2021 |
2021-2022 |
