Electronic components and assemblies, power distribution switch control equipment and accessories, electronic components, pneumatic components, auto parts, motorcycle parts, mechanical equipment and accessories, explosion-proof electrical appliances and accessories, electromechanical equipment and accessories, lamps and accessories, communication equipment (excluding ground satellite transceiver devices); R&D, manufacturing, processing and sales of wires and cables, metal stamping parts, instruments (excluding measuring instruments), plastic parts, molds, rivets; sales of alloy materials; import and export of goods, import and export of technology.