Karnataka is the manufacturing hub for some of the largest public sector industries in India, including Hindustan Aeronautics Limited, National Aerospace Laboratories, Bharat Heavy Electricals Limited, Bharat Earth Movers Limited and HMT (formerly Hindustan Machine Tools), which are based in Bangalore. Many of India's premier science and technology research centres, such as Indian Space Research Organisation, Central Power Research Institute, Bharat Electronics Limited and the Central Food Technological Research Institute, are also headquartered in Karnataka. Mangalore Refinery and Petrochemicals Limited is an oil refinery, located in Mangalore.