(L-R) Germany's Foreign Minister Guido Westerwelle, British Foreign Secretary William Hague, Chinese Foreign Minister Wang Yi, U.S. Secretary of State John Kerry, French Foreign Minister Laurent Fabius, Russia's Foreign Minister Sergei Lavrov, EU foreign policy chief Catherine Ashton and Iranian Foreign Minister Mohammad Javad Zarif gather at the United Nations Palais in Geneva November 24, 2013. Iran and six world powers reached a breakthrough deal early on Sunday to curb Tehran's nuclear programme in exc

Centrifuge R&D seen as holdup in implementing Iran nuclear deal

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(L-R) Germany's Foreign Minister Guido Westerwelle, British Foreign Secretary William Hague, Chinese Foreign Minister Wang Yi, U.S. Secretary of State John Kerry, French Foreign Minister Laurent Fabius, Russia's Foreign Minister Sergei Lavrov, EU foreign policy chief Catherine Ashton and Iranian Foreign Minister Mohammad Javad Zarif gather at the United Nations Palais in Geneva November 24, 2013. Iran and six world powers reached a breakthrough deal early on Sunday to curb Tehran's nuclear programme in exc

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