AlQa'dah 8, 1433, Sep 24, 2012, SPA -- Prince Mohammed bin Fahd bin Abdulaziz, Governor of Eastern Region, opened here today the fourth Saudi International Oil and Gas Exhibition, organized by Dhahran International Exhibitions Company in collaboration with IES. Upon arrival, Prince Mohammed toured the exhibition and was briefed on the activities of the three-day event. More than 190 local and international companies from 21 different countries participate in this exhibition.