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SC 13D/A

Beneficial Ownership Report

ClearSign Technologies Corp Filed 2013-02-25 Acc 0001144204-13-011009

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SC 13D/A Beneficial Ownership Report , v336186_sc13d-a.htm

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2015-03-25 SC 13D/A Beneficial Ownership Report
2013-02-25 SC 13D/A Beneficial Ownership Report
2013-02-22 8-K Regulation FD disclosure
2013-02-22 10-K Annual Report
2012-06-26 SC 13D/A Beneficial Ownership Report

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