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- 18 May 17 DAWSON GEOPHYSICAL / WILLIAM J BARRETT ownership change
- 17 May 17 DAWSON GEOPHYSICAL / WILLIAM J BARRETT ownership change
- 16 May 17 DAWSON GEOPHYSICAL / WILLIAM J BARRETT ownership change
- 4 Apr 17 DAWSON GEOPHYSICAL / WILLIAM J BARRETT ownership change
- 3 Apr 17 DAWSON GEOPHYSICAL / CRAIG W COOPER ownership change
- 3 Apr 17 DAWSON GEOPHYSICAL / Ploeg Mark A Vander ownership change
- 3 Apr 17 DAWSON GEOPHYSICAL / GARY M HOOVER ownership change
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