In this April 18, 2007 photo, workers install the logo for ZTE, a leading Chinese communications company, on top of an office building in Nanjing in eastern China's Jiangsu province. Washington has imposed restrictions on the ability of one of China's biggest telecoms equipment makers, ZTE Corp., to use American components after concluding the state-owned company improperly exported U.S. technology to Iran. Sanctions that took effect Tuesday, March 8, 2016, were imposed after ZTE was found to be 