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Iran has some of the world's largest reserves of oil and natural gas, but for years the country's energy industry has suffered from tough sanctions imposed over its nuclear programme, hindering access to foreign investment.

But at a recent major oil and gas exhibition in Tehran, the presence of big international players, including Chinese companies seeking to capitalise on billions of dollars worth of contracts, showed that the market was alive and well.  

Al Jazeera's Alireza Ronaghi reports from Tehran.

Source: Al Jazeera