Manufacturing of forgings and powder metallurgy products; sales of forgings and powder metallurgy products; manufacturing of metal structures; sales of metal structures; sales of metal chains and other metal products; manufacturing of metal chains and other metal products; sales of metal products; repair of metal products; sales of household appliances and spare parts; manufacturing of household appliances; manufacturing of motorcycle spare parts; retail of motorcycles and spare parts; wholesale of automobile spare parts Development; automobile parts and accessories manufacturing; mechanical parts and parts processing; mechanical parts and parts sales; mechanical equipment research and development; mechanical equipment sales; general parts manufacturing; general equipment manufacturing (excluding special equipment manufacturing); general equipment repair; intelligent basic manufacturing equipment manufacturing; intelligent basic manufacturing equipment sales; special equipment manufacturing (excluding licensed professional equipment manufacturing).