| Filed On | Filing |
|---|---|
| 07 Jun 2013 | 10-K |
| 07 Jun 2013 | 10-K |
| 05 Apr 2011 | 10-K |
| 17 May 2010 | FORM 10-K |
| 31 Mar 2009 | OP-TECH MARCH 30,2009 |
| 23 Mar 2007 | OP-TECH ENVIRONMENTAL SERVICES 12/31/2006 10-K |
| 30 Mar 2006 | OP-TECH 12/31/05 10-K |
| 29 Mar 2005 | OP-TECH 12/31/04 10-K |
| 30 Mar 2004 | OP-TECH 12/31/2003 10-K |
| 26 Mar 2003 | OP-TECH ENVIRONMENTAL SERVICES, INC. 12/31/02 10-K |
| 29 Mar 2002 | OTES 10-K |
| 30 Mar 2001 | OP-TECH ENVIRONMENTAL SERVICES, INC. 12/31/00 10-K |
| 30 Mar 2000 | 10-K |
| 31 Mar 1999 | 10-K |
| 15 Apr 1998 | 10-K |
| 23 Apr 1997 | 10-K |
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