Mechanical equipment research and development; general equipment manufacturing (excluding special equipment manufacturing); special equipment manufacturing (excluding licensed professional equipment manufacturing); mechanical equipment sales; electrical equipment sales; mechanical and electrical equipment sales; general parts manufacturing; mechanical parts and parts processing; mechanical parts and parts sales; mold manufacturing; mold sales; rubber product sales; tire sales Wholesale of automobile parts and accessories; wholesale of motorcycles and spare parts; wholesale of bicycles and spare parts; sales of plastic products; sales of electronic products; wholesale of hardware products; sales of metal tools; sales of metal products; repair of metal products; repair of general equipment; maintenance of electronic and mechanical equipment (excluding special equipment); general mechanical equipment installation services; import and export of goods; import and export of technology.