Harbin Welding Research Institute Co., Ltd. Zhengzhou Machinery Research Institute Co., Ltd. Zhongji First Design and Research Institute Co., Ltd. Wuhan Material Protection Research Institute Co., Ltd. Beijing Machinery Industry Automation Research Institute Co., Ltd. Beijing Institute of Mechanical and Electrical Research Co., Ltd. Machinery Development Technology Co., Ltd. China Machinery Productivity Promotion Center Zhongji Huanyu Certification and Inspection Co., Ltd. Beijing Machinery Science Guochuang Lightweight Research Institute Co., Ltd. Yunnan Institute of Mechanical Research and Design Jiangsu Branch of General Academy of Mechanical Science Research Co., Ltd. Haixi (Fujian) Branch Co., Ltd., General Academy of Mechanical Sciences Qingdao Branch of General Academy of Mechanical Science Research Co., Ltd.