| Filed On | Filing |
|---|---|
| 13 Mar 2012 |
Form 3/A: Dame William Timothy, VP Pumping and Wireline
Holds 55,755 shares of Common Stock |
| 05 Apr 2010 |
Form 3/A: Rogers Doug, VP - Marketing
Holds 12,043 shares of Common Stock |
| 07 Nov 2006 |
Form 3/A: Huseman Kenneth V, Director
Holds 531,160 shares of Common Stock |
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