R&D, production and sales: mechanical parts, hardware, fixtures, jigs, molds, electromechanical accessories, home appliances and accessories; self-operated and agent import and export business of various commodities and technologies. General items: retail of medical masks; wholesale of medical masks; sales of second-class medical devices; retail of protective equipment for medical staff; wholesale of protective equipment for medical staff; sales of office equipment consumables; retail of sporting goods and equipment; sales of plastic products; sales of rubber products; sales of special chemical products (excluding hazardous chemicals); sales of metal products