Anti-theft devices Automobiles 64 Security systems 48 Global system for mobile communications 22 Mobile communication systems 12 Security measures 10 Text messages (Telephone systems) 8 Electronic alarm systems 6 Safety measures 6 Control systems 4 Design and construction 4 Global Positioning System 4 Instant messaging 4 Microcontrollers 4 Application software 2 Automatic control 2 Integrated circuits 2 Motor vehicles 2 Personal communication service systems 2 Programmable controllers 2 Radio frequency identification systems 2 Smart cards 2 System design 2 Vehicles--Security measures 2 Electronic security systems 1