Article 10
The prohibitions in Articles 8 and 9 shall not apply to: (a) transactions required by a trade contract concerning key equipment or technology in the exploration of crude oil and natural gas, production of crude oil and natural gas, refining, liquefaction of natural gas concluded before 27 October 2010, or ancillary contracts necessary for the execution of such contracts, or by a contract or agreement concluded before 26 July 2010 and relating to an investment in Iran made before 26 July 2010, nor shall they prevent the execution of an obligation arising there from; or (b) transactions required by a trade contract concerning key equipment or technology for the petrochemical industry concluded before 24 March 2012, or of ancillary contracts necessary for the execution of such contracts, or by a contract or agreement concluded before 23 January 2012 and relating to an investment in Iran made before 23 January 2012, nor shall they prevent the execution of an obligation arising therefrom; provided that the natural or legal person, entity or body seeking to engage in such transactions, or to provide assistance to such transactions, has notified, at least 20 working days in advance, the transaction or assistance to the competent authority of the Member State in which it is established.