Couplers [data processing equipment]; computer programs, downloadable; galvanometers; dynamometers; integrated circuits; transformers [electricity]; distribution boxes [electricity]; switchboxes [electricity]; connectors [electricity]; converters, electric; inverters [electricity]; switches, electric; commutators; circuit closers; junction boxes [electricity]; regulating apparatus, electric; current rectifiers; cell switches [electricity]; distribution boards [electricity]; distribution conso...