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 Assam Oil Company and Attock Oil Company were the only entities producing oil in the northeastern and northwestern regions of undivided India, respectively, with minimal exploration activities.