1920s Automobile By algeny Jan 1, 1919 ,first single foot pedal operates 4- Jan 1, 1920 First luxury cars made Jan 1, 1921 Airbag is invented Jan 1, 1926 power steering system introduced Jan 1, 1929 first air conditioned cars Jan 1, 1931 mercedes- benz makes independent Jan 1, 1940 Jeep designed Jan 10, 2017 1 jan 1913, ford makes first makes first moving assembly line