Oscillographs; Tool measuring instruments; Teaching robots; Computer network adapters, switches, routers and hubs; Circuit boards; Printed circuit boards; Electrical transducers; Touch screens; LCDs; Radios; Downloadable computer operating programs; USB charging ports; Rechargeable batteries; Semiconductor devices; Power adapters; Integrated circuit cards; Global positioning system (GPS) apparatus; Portable media players; Batteries, electric; Chargers for electric accumulators