Thiruvananthapuram is a major aerospace research centre in India. The Vikram Sarabhai Space Centre, the most significant and leading centre of ISRO, and several space-related, state-owned ISRO centres such as Thumba Equatorial Rocket Launching Station, Liquid Propulsion Systems Centre, and ISRO Inertial Systems Unit are based in Thiruvananthapuram. The BrahMos Aerospace Trivandrum Limited is one of the leading missile integration and defence production units in India. Other enterprises include Travancore Titanium Products, Kerala Automobiles Limited, MILMA, English Indian Clays, Keltron, Trivandrum Rubber Works and HLL Lifecare Limited.