Design, research and development, manufacturing, installation, repair, maintenance, and sales of: snow removal equipment, sweeping equipment, sanitation equipment, electromechanical equipment, cleaning equipment, aerial work equipment, environmental protection equipment, computers and peripheral equipment, power distribution equipment; sales of: lamps, instruments and meters, chemical products, building decoration materials, metal materials, bicycles, automobiles (excluding used cars), sanitation vehicles, garbage bins; leasing of mechanical equipment (excluding used cars), automobile repair and maintenance, technical consulting services, and import and export of goods and technologies.