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 for use in electrical ap...