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Directory Results for 20549 8K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report: August 18, 2015 (Date of earliest event reported) PRINCIPAL FINANCIAL GROUP, INC to 20549 8K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report: August 4, 2014 Commission file number 00111602 APPLIED NANOTECH HOLDINGS, INC