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US deputy energy secretary Daniel Poneman

Robert Shaw, right, with Arkansas Power Electronics International demonstrates user interface for equipment to U.S. Deputy Energy Secretary Daniel Poneman during a tour of a lab at APEI on Wednesday, May 23, 2012, in Fayetteville, Ark.

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Robert Shaw, right, with Arkansas Power Electronics International demonstrates user interface for equipment to U.S. Deputy Energy Secretary Daniel Poneman during a tour of a lab at APEI on Wednesday, May 23, 2012, in Fayetteville, Ark.