Ahmad Mohammadi said on Saturday that, undoubtedly, independence, self-belief and reliance on domestic capabilities should be regarded as one of the most important achievements of the Islamic Revolution for the country.

Addressing a ceremony to celebrate the 41st anniversary of the victory of the Islamic Revolution, Mohammadi said his colleagues had successfully localized manufacturing of over 1,000 items and parts in the petroleum industry since last year.

NISOC accounts for over 80 percent of Iran's crude oil output.