In January 1924, Walter Chrysler launched the well-received Chrysler automobile. The Chrysler was a 6-cylinder automobile, designed to provide customers with an advanced, well-engineered car, but at a more affordable price than they might expect. (Elements of this car are traceable to a prototype which had been under development at Willys during Chrysler's tenure). Among the innovations in its early years were the first practical mass-produced four-wheel hydraulic brakes, a system nearly completely engineered by Chrysler with patents assigned to Lockheed, and rubber engine mounts to reduce vibration. Chrysler also developed a wheel with a ridged rim, designed to keep a deflated tire from flying off the wheel. This wheel was eventually adopted by the auto industry worldwide.