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![]() Qingdao Director Steel Structure Co.,Ltd. is one leader manufacturer engaged in the research, development, production, sale and service of steel structure. We have been in this line for 16 years. Portal frame is the usual type in the industrial steel workshop,metal warehouse,steel structure hangar, steel shed, poultry farming building, prefab house. Other types also could be designed and manufacturer as per clients' request. 2. Our Factory We are located in Qingdao with convenient transportation access. We are managed by dedicated and ... [Details] |