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Pakistani oil refinery which is a subsidiary of UK-domiciled Attock Oil Company. It is based in Karachi, Pakistan.[ It is a petroleum refinery and petrochemical complex engaged in the manufacture and sale of asphalts, BTX, fuel products and lubes for domestic consumption and export. National Refinery Limited is the second largest capacity refinery of Pakistan in terms of crude oil processing facilities and is the only lube oil refinery of Pakistan. The company was incorporated in 1963 and first lube refinery was constructed in June 1966. Hydroskimming fuel refinery was commissioned in April 1977 and its capacity was increased in 1985. BTX (petrochemical) plant was constructed in April 1979 which was the first petrochemical unit of the country. Second lube refinery was constructed in February 1984. Since then various expansions of the refinery have been made.[1] In 2005, Attock Group acquired majority shareholding of the company – with Pakistan Oilfields and Attock Refinery Limited both holding 25 percent shares each. Islamic Development Bank of Saudi Arabia holds 15 percent of the total shares.[1]