Manufacturing of various types of high-silicon cast iron anodes, zinc-magnesium-aluminum alloy sacrificial anodes, corrosion protection instruments, reference electrodes, test piles, vehicle supporting equipment, sanitation equipment, and stainless steel products; sales of wires and cables, instruments and meters, electronic accessories (excluding state-controlled materials); professional contracting of waterproof, anti-corrosion, and thermal insulation engineering (operating within the scope of qualification permits); installation of electrical instrumentation engineering; sales of building materials; construction of housing construction, decoration engineering, pipeline engineering, water and electrical installation engineering, earthwork engineering, landscaping engineering, steel structure engineering, foundation and foundation engineering, municipal engineering, building curtain wall engineering, environmental protection engineering, sports venue facilities engineering, and urban road lighting engineering; construction labor subcontracting; housing repair; housing demolition; housing leasing; oilfield engineering technical services. (Projects involving licensed operations must obtain permission from relevant departments before operation.)