Design, production, sales, repair, and technical services for power transmission and transformation facility components and accumulators; design, production, sales, repair, and technical services for hydraulic machinery, pneumatic power machinery, and general mechanical equipment; design, production, sales, repair, and technical services for metal products and vehicle components; technology development, consulting, transfer, and services in the accumulator field; import and export of goods and technologies; technical performance testing of piston accumulators.