R&D, production, sales and maintenance: general mechanical equipment and its spare parts, automation equipment and its spare parts, electromechanical equipment and its spare parts; production and sales: labor protection supplies, daily masks (non-medical); general mechanical equipment installation, electromechanical equipment installation; automated production line design, consultation and transformation; mechanical equipment design, maintenance services; general mechanical equipment technical consulting services; import and export of goods or technology (except for the import and export of goods and technology prohibited by the state or involving administrative approval).