Automobiles 5,200 Design and construction 1,311 Maintenance and repair 976 Motors 936 Springs and suspension 466 Brakes 391 Motor vehicles 346 Electronic equipment 284 Automobile industry and trade 249 Steering-gear 234 Air conditioning 214 Automobile parking 210 Performance 197 Electric equipment 185 Bodies 175 Automobiles, Racing 173 Materials 173 Heating and ventilation 172 Aerodynamics 171 Safety measures 164 Chassis 151 Automatic control 148 Testing 140 Tires 120 Data processing 118 Transmission devices 114 Wheels 112 Examinations 108 Exhaust gas 107 Dynamics 105