Stock Photo - A man holds up a tablet computer in front of a model by the company GP Joule at the exhibition booth of Integrated Energy Plaza at the Hanover Fair in Hanover, Germany, 23 April 2016. The world's biggest industry fair Hanover Messe is being opened by US-President Obama on 24 April. The United States of America are this year's partnering country. Photo: Sebastian Gollnow/dpa | usage worldwide. - Hanover/Lower Saxony/Germany

Stock Photo: A man holds up a tablet computer in front of a model by the company GP Joule at the exhibition booth of Integrated Energy Plaza at the Hanover Fair in Hanover.

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