Electric converters; power supply filters; satellite navigation system, namely, a global positioning system GPS; electrical power supplies; directional navigation system, namely, a global positioning system; battery chargers; uninterrupted electrical power supplies; lighting ballasts; automatic voltage regulators; electric motor controllers; AC/DC converters; DC/DC converters; voltage regulators; thermostats; temperature controllers for controlling temperature of medical instruments and containers for medical fluids; electric relays; rectifiers; electrical transformers; telephones; electric switches; voltage surge suppressors