Apparatus and instruments for conveying, distributing, transforming, storing, regulating or controlling electric current, and components thereof; electrical apparatus, namely, transformers, lighting ballasts, reactors, chokes, magnetic coils, voltage regulators; electric components in the nature of harmonic filters; electrical, electromechanical and electronic components, apparatus, and systems, namely, self-inducting coils, filter chokes, RFI filters, aerials, standard and specific heat sink...