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Liaoning Hanzheng Environmental Protection Equipment Engineering Co., Ltd.
Qingdao Kaijie Heavy Industry Machinery Co., Ltd.
Guangxi Huihuang Langjie Environmental & Tech Co., Ltd.
Qingdao Olympia Heat Energy Equipment Co., Ltd.
Weifang Better Heavy Machinery Science and Technology Co., Ltd.
Shandong Better Environmental Protection Technology Co., Ltd.
Shenzhen Lianxin Testing Equipment Co., Ltd.
Qingdao Guangneng Rubbers & Plastics Chemical Co., Ltd.