CASE
China Construction Fifth Engineering Bureau Co., Ltd.
China Railway Fifth Bureau Group Co., Ltd.
China Communications Construction Group Limited
Yanchang Petroleum Materials & Equipment Group Co., Ltd.
Dali Pu Petroleum Special Pipe Co., Ltd.
Materials Supply Corporation of Xinjiang Petroleum Administration Co., Ltd.
Xi'an Special Pipe Branch of Baoji Petroleum Steel Pipe Co., Ltd.
CNPC Bohai Petroleum Equipment Manufacturing Co., Ltd. Tianjin Special Pipe Branch
