NOV Inc.
Rädlinger primus line GmbH
Shandong Donghong Pipe Industry Co., Ltd.
Lesso
Baoji Tianlian Huitong Composite Materials Co., Ltd.
Xinjiang PetroChina Tubular Engineering Co., Ltd.
Gongqingcheng Ruitai Pipe Technology Co., Ltd.
Jiangsu Zhengdao Marine Technology Co., Ltd.
Ningbo OPR Offshore Engineering Equipment Co., Ltd.
PipeChina
Hebei Yutong Special Rubber Hose Co., Ltd.
Shandong Beifang Oujin New Materials Technology Co., Ltd.
