Before the independence of India in 1947, the Assam Oil Company in the north-eastern and Attock Oil Company in the north-western part of the undivided India were the only oil-producing companies, with minimal exploration input.
Prior to India's independence in 1947, the only two oil-producing companies in the northern and northeastern regions of undivided India were the Assam Oil Company and the Attock Oil Company. Both had minimal exploration activities.