General items: manufacture of specialized equipment (excluding licensed specialized equipment manufacture); sale of special equipment; rental of special equipment; manufacture of industrial automated control systems; manufacture of instrument instruments; sale of instrument instruments; manufacture of gas-powered machinery and components; sale of pressurized machinery and components; sale of gas-powered machinery and components; sale of general valves and spin-off equipment (without special equipment manufacture); sale of valves and spin-off; manufacture of electrical equipment; sale of electrical equipment; manufacture of general-purpose equipment (without special equipment manufacture); manufacture of general-purpose equipment; sale of specialized equipment for environmental protection; installation of general machinery equipment; sale of technical services, technical and technical advice, technology exchange, technology transfer, technology promotion; sale of electronic equipment; sale of fibre-optic cables; sale of electrical equipment; sale of electrical equipment; sale of electrical equipment without the use of special equipment; sale of electrical equipment without the use of special equipment; production of generic spare parts; production of specialized equipment for environmental protection; sale of specialized equipment for general mechanical equipment; sale of technical services, technical and technological communications, technology transfer, technical promotion; sale of electronic equipment; sale of fibre-optic cables; sale of electrical equipment; and