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Qingdao Helm Import and Export Co., Ltd.
Lianyungang Hongkang Quartz Products Co., Ltd.
Lianyungang Shenhui Silicon Mstar Technology Co., Ltd.
Dengfeng City Ludian Town Xingguang Abrasives Factory
Donghai Yukang Quartz Material Co., Ltd.
Hebei Leijie Trade Co., Ltd.
Lianyungang Jialei International Trade Co., Ltd.
Zhengzhou Mission Ceramic Products Co., Ltd.