Audio-frequency transformers; Choking coils for use in electrical apparatus; Earphones; Electromagnetic interference filters; Electronic coils; Electronic components in the nature of capacitors, connectors, filters, oscillators, relays, switches, transformers, resistors, semiconductors, integrated circuits, rectifiers, transistors; Electronic noise filters; Electronic resonators; High-frequency switching power supplies; Magnetic coils; Magnetic cores; Photoresistors; Step down transformers; S...