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Representatives of 13 world states and 306 domestic companies are present in the two international events held in Tehran.
The participating countries include China, Turkey, South Korea, Austria, Germany, Italy, Switzerland, Spain, India, Denmark, Poland, Netherlands and France, the Islamic republic news agency reported.
Iranian President痴 Chief of Staff Mohammad Nahavandian, top managers and experts in the area of water and electricity are also attending the events.
By Fars News Agency
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