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- 16 May 17 DAWSON GEOPHYSICAL / WILLIAM J BARRETT ownership change
- 4 Apr 17 DAWSON GEOPHYSICAL / WILLIAM J BARRETT ownership change
- 4 Apr 17 DAWSON GEOPHYSICAL / WILLIAM J BARRETT ownership change
- 3 Apr 17 DAWSON GEOPHYSICAL / ALLEN T MCINNES ownership change
- 14 Mar 17 DAWSON GEOPHYSICAL / Ploeg Mark A Vander ownership change
- 17 Feb 17 DAWSON GEOPHYSICAL / Daniel G Winn ownership change
- 3 Jan 17 DAWSON GEOPHYSICAL / WILLIAM J BARRETT ownership change
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