Tasnim | Fouad Ashtari: The 23rd Iran International Oil, Gas, Refining and Petrochemical Exhibition kicked off its work today morning in the presence of 1,053 domestic companies and also 600 foreign companies from 38 world countries. The inaugural ceremony of 23rd edition of Iran Intl. Oil, Gas, Refining and Petrochemical Exhibition was held today morning at the venue of Tehran Permanent International Fairgrounds in the presence of Iranian Oil Minister Bijan Namdar Zanganeh and senior officials of this industry.