Sales of metallurgical special equipment; Manufacture of hydraulic power machinery and components; Sales of hydraulic power machinery and components; Hydraulic power machinery and components manufacturing; Manufacture of ordinary valves and cocks; Sales of valves and cocks; Sales of pumps and vacuum equipment; Lubricating oil sales; General equipment manufacturing (excluding special equipment manufacturing); Manufacture of liquid-tight components and systems; Pump and vacuum equipment manufacturing; General equipment repair; Repair of metal products; Special equipment repair; Instrument repair; Pneumatic power machinery and components manufacturing; Technical service, technical development, technical consultation, technical exchange, technology transfer and technology popularization; Manufacture of metallurgical special equipment; Sales of mechanical parts and spare parts; Sales of electrical machinery and equipment; Retail of electronic components; Mechanical equipment sales; General parts manufacturing