Special equipment manufacturing; special equipment installation, modification, and repair; special equipment inspection and testing; special equipment design. General items: pneumatic power machinery and components manufacturing; pneumatic power machinery and components sales; general valve and cock manufacturing (excluding special equipment manufacturing); valve and cock sales; valve and cock research and development; general parts manufacturing; general equipment manufacturing (excluding special equipment manufacturing); mechanical parts and components processing; mechanical parts and components sales; electronic component retail; power electronic component manufacturing; electronic component manufacturing; electronic components and electromechanical component equipment manufacturing; power electronic component sales; motor manufacturing; electric motor manufacturing; special equipment sales; power distribution switchgear control equipment manufacturing; power transmission and distribution and control equipment manufacturing; power distribution switchgear control equipment research and development; power transmission and distribution monitoring and control equipment manufacturing; power distribution switchgear control equipment sales; mechanical and electrical equipment manufacturing; power transmission and distribution monitoring and control equipment sales; intelligent power transmission and distribution and control equipment sales; transformer, rectifier, and inductor manufacturing; electrical accessory manufacturing; other electronic device manufacturing; special equipment repair; technology import and export; goods import and export; import and export agency; general mechanical equipment installation services; road cargo transportation for ordinary freight vehicles with a total mass of 4.5 tons or less (excluding network freight and dangerous goods); wooden container sales.