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