| Filed On | Filing |
|---|---|
| 10 Nov 2011 | DEF 14C |
| 29 Jul 2010 | SCHEDULE 14C |
| 17 Jul 2009 | FORM DEFINITIVE 14C |
| 03 Jul 2008 | DEF 14C |
| 18 Apr 2006 | OP-TECH INFORMATION STATEMENT |
| 30 Mar 2005 | OP-TECH INFORMATION STATEMENT |
| 09 Apr 2004 | OP-TECH ENVIRONMENTAL SERVICES, INC. INFORMATION STMT. |
| 26 Mar 2003 | OP-TECH ENVIRONMENTAL SERVICES, INC. INFORMATION STMT. |
| 06 Nov 2002 | INFORMATION STATEMENT |
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