Ronald Pofalla, head of the German Chancellery (L) and Lower Saxony state Prime Minister David McAllister (R) pose with power plugs at the stand of RITTAL during their opening tour at the "Hannover Messe" industrial trade fair in Hanover April 4, 2011. The world's leading fair for industrial technology, with about 6,500 exhibitors from 65 nations, runs till April 8 with France as this year's partner country. REUTERS/Morris Mac Matzen (GERMANY - Tags: POLITICS SCI TECH BUSINESS)