Manufacturing of construction engineering machinery; manufacturing of metal processing machinery; manufacturing of metal wire ropes and their products; sales of metal wire ropes and their products; metal surface treatment and heat treatment processing; non-residential real estate leasing; loading and unloading handling; road freight transport of ordinary freight vehicles with a total mass of 4.5 tons or less (excluding network freight and dangerous goods); manufacturing of mining machinery; sales of mining machinery; sales of construction engineering machinery; information consulting services (excluding licensed information consulting services); manufacturing of metal structures; sales of metal structures; manufacturing of fasteners; sales of fasteners; technical services, technical development, technical consulting, technical exchange, technology transfer, and technology promotion; manufacturing of metal tools; labor services (excluding labor dispatch); import and export of goods.