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- 1 Apr 20 MDU RESOURCES / Edward A Ryan ownership change
- 1 Apr 20 MDU RESOURCES / DAVID M SPARBY ownership change
- 10 Mar 20 MDU RESOURCES / Jason L Vollmer ownership change
- 18 Feb 20 MDU RESOURCES / Jason L Vollmer ownership change
- 18 Feb 20 MDU RESOURCES / Jeffrey S Thiede ownership change
- 18 Feb 20 MDU RESOURCES / Margaret A Link ownership change
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