2 Zhong Jian Steel Structure Co., Ltd.
3 Zhejiang Southeast Power Grid Group Co., Ltd.
4. China 22nd Metallurgical Group Co., Ltd. Metal Structure Engineering Branch
Jiangsu Huning Iron and Steel Machinery Co., Ltd.
6 Zhejiang Hangxiao Company Limited by Share Ltd
7 Hangzhou Hengda Steel Structure Industry Co., Ltd.
8. Hongfeng Industrial Group Co., Ltd.
9 Chaofeng Steel Structure Group Co., Ltd.
10 Henan tianfeng steel structure co., ltd
1 1 Butler (Shanghai) Co., Ltd.
12 Shandong Laigang Construction Co., Ltd.
13 Zhejiang dida steel structure co., ltd
14 Shaanxi Construction Engineering Group Machinery Construction Co., Ltd.
15 Baosteel steel structure co., ltd
16 Zhejiang Sheng Da Tower Co., Ltd.
17 Zhejiang Jin Xin Steel Structure Group Co., Ltd.
18 Beijing North Space Steel Structure Co., Ltd.
19 Jiangsu Tiandi Steel Structure Engineering Group Co., Ltd.
20 Shandong Classic Building Technology Co., Ltd.
2 1 Wenzhou Taichang Tower Manufacturing Co., Ltd.
Shanghai Zhongyuan Kawasaki heavy industry steel structure co., ltd.
23 Shanghai Machinery Construction Co., Ltd.
24 Zhejiang Zhongnan Construction Group Steel Structure Co., Ltd.
25 Xuzhou Tongyu Space Steel Structure Co., Ltd.
26 Hunan Jinhai Steel Structure Group Co., Ltd.
27 Jiangsu Changhong Steel Structure Engineering Co., Ltd.
28 Pearl Group Zhejiang Steel Structure Co., Ltd.
29. Wuyang Construction Group Co., Ltd
30 Zheng Guang Steel Structure Co., Ltd.