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