H&G Hegmanns Ingenieurgesellschaft mbH
Zhongxing Construction Co. Ltd.
Guangzhou Metro Design & Research Institute Co., Ltd.Guangdong Sheng, China
Seiler AGSwitzerland
Guangxi Construction Engineering Group No. 2 ConstructionGuangxi Zhuangzu Zizhiqu, China
Thöni Industriebetriebe GmbHTirol, Austria
Chemtex (Shanghai) Chemical Engineering Co., Ltd.
China Triumph International Engineering Co., Ltd.
Torkret GmbH
Anhui Jieyuan Environmental Protection Technology Co. Ltd.
CTI Engineering Co., Ltd.Tokyo, Japan
Global Design Technology SA