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Germany, Italy, South Africa and of course Russia (Read: Russia and proxy North Korea) are all involved in exporting technology to Iran for their nuclear ambitions. North Korea, a surrogate or proxy of Russian nuclear policy and essentially now in the Chinese orbit also supplies them.

World Nuclear Organization page on Iran: http://www.world-nuclear.org/info/Country-Profiles/Countries-G-N/Iran/

Iran (Irony not lost in this) ISIS - Institute for Science and International Security webpage: http://isis-online.org/isis-reports/detail/irans-advanced-centrifuges/

Wikipedia has this on Iran's history building a Nuclear Program: http://en.wikipedia.org/wiki/Nuclear_program_of_Iran

British Broadcasting Corp news release on Russian building nuclear reactors in Iran (November 2014): http://www.bbc.com/news/world-middle-east-30015464

In 1974, Iran loaned $1.18 billion to the French Atomic Energy Commission to build the multinational Eurodif enrichment plant at Tricastin, and it secured a 10% equity in the enterprise, entitling it to 10% of output.

In 1980s Iran purchased 450 tonnes of uranium (531 t U3O8) from South Africa.

The IR-40 design is very similar to those used by India and Israel to make plutonium for nuclear weapons, and was apparently designed by Russia's NIKIET.

Pakistan and German produced centrifuges were sold to Iran. The Pakistan were probably of Russian manufacture or design and poorer quality than German made which transited via Italy and Dubai.