Machining of mechanical parts and components; manufacture of metal structures; manufacture of mechanical and electrical equipment; manufacture of dust removal technology equipment; manufacture of specialized equipment (excluding licensed specialized equipment); manufacture of railway locomotive and rolling stock parts; manufacture of hydraulic power machinery and components; manufacture of general equipment (excluding special equipment); manufacture of specialized textile equipment; manufacture of power distribution switchgear equipment; manufacture of power transmission and distribution control equipment; professional design services; industrial engineering design services; technical services, technology development, technical consulting, technical exchange, technology transfer, and technology promotion.