Design and construction Automobiles 152 Airplanes 79 Integrated circuits 69 Data processing 55 Motor vehicles 40 Electronic apparatus and appliances 37 History 33 Bridges 32 Maintenance and repair 29 Printed circuits 28 Equipment and supplies 27 Very large scale integration 27 Chemical plants 26 Environmental aspects 24 Computer-aided design 23 Materials 23 Sustainable buildings 23 Motors 22 Radio circuits 21 Safety measures 20 Digital integrated circuits 19 Electronic circuit design 19 Roads 19 Space vehicles 18 Aerodynamics 16 Aeronautics 16 Chemical reactors 16 Electronic digital computers 16 Semiconductors 16