Automobiles Design and construction 1,145 Maintenance and repair 940 Motors 904 Springs and suspension 454 Brakes 382 Motor vehicles 313 Electronic equipment 281 Steering-gear 232 Air conditioning 212 Performance 189 Electric equipment 179 Heating and ventilation 171 Bodies 169 Materials 169 Chassis 147 Aerodynamics 146 Safety measures 142 Testing 136 Automatic control 125 Tires 118 Transmission devices 114 Wheels 110 Exhaust gas 107 Examinations 94 Cooling systems 91 Fuel systems 90 Fuel injection systems 89 Pollution control devices 88 Power trains 85