Amplifiers; Electric light switches; Electroacoustic transducers; Electron tubes; Electronic and optical communications instruments and components, namely, cable television transmitters; Electronic notice boards; Emergency warning lights; Flash lamps; Flashing safety lights; Helmet safety lights; Light pens; Luminous house numbers; Luminous pointers; Luminous signs; Photovoltaic cells; Semiconductor devices; Semiconductors; Silicon chips; Silicon wafers; Transistors; Video screens