Research and development of mechanical equipment; manufacturing of ovens, furnaces and electric furnaces; sales of ovens, furnaces and electric furnaces; general equipment manufacturing (excluding special equipment manufacturing); special equipment manufacturing (excluding licensed professional equipment manufacturing); mechanical equipment sales; electronic and mechanical equipment maintenance (excluding special equipment); general parts manufacturing; mechanical parts, Parts processing; auto parts remanufacturing; auto parts and accessories manufacturing; auto parts wholesale; auto parts retail; motorcycle parts manufacturing; motorcycles and parts wholesale; motorcycles and parts retail; hardware product manufacturing; hardware product wholesale; hardware product retail; goods import and export; technology import and export.