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KARACHI: Special Assistant to the Prime Minister (SAPM) on Petroleum and Power Tabish Gauhar visited head office of Pakistan State Oil (PSO) here on Friday. PSO Board of Management (BoM) Chairman Zafar I. Usmani and PSO Managing Director & CEO Syed Taha welcomed Tabish Gauhar along with the company’s senior management, said a spokesperson of the PSO.