Headphones; Accumulator boxes; Accumulators, electric; Audio- and video-receivers; Batteries for lighting; Batteries, electric; Battery boxes; Battery chargers; Chargers for electric accumulators; Compasses for measuring; Computer peripheral devices; Electromagnetic coils; Plates for batteries; Power switches; Slide or photograph projection apparatus; Solar batteries; Solar panels for the production of electricity; Surveying instruments; Switches, electric; Time clocks