Acoustic couplers; Apparatus and instruments for conveying, distributing, transforming, storing, regulating or controlling electric current; Audio-video receivers; Cabinets for loudspeakers; Earphones; Electric cables; Electric connectors; Electric control panels; Electric couplings; Electric switches; Electrical plugs and sockets; Electrical and electronic connectors; Fiber optic cables; Loudspeakers; Photovoltaic cells also including a solar thermal collector sold as a unit; Relays, electri...