Capacitors; [ Circuit breakers; ] Converters, electric; [ Couplings, electric; ] Electric control panels; [ Electronic controllers used to reduce power consumption; Electronic numeric displays; ] Light emitting diodes (LEDs); [ Pattern recognition systems composed of computer chips, computer hardware and software; Printed circuit boards; ] Relays, electric; [ Resistances, electric; Rheostats; ] Step-up transformers; Switches, electric; Triodes; [ Variometers; ] Wire connectors; Choking coils ...