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Nihon Dempa Kogyo Co., Ltd.Elkem ASADaishinku Corp.Fuyao Glass Industry Group Co., Ltd.TXC Corp.Hubei Feilihua Quartz Glass Co., Ltd.Jiangsu Pacific Quartz Co., Ltd.Tunghsu Azure Renewable Energy Co., Ltd.Siward Crystal Technology Co., Ltd.Lianyungang Taosheng Fused Quartz Co. Ltd.Caesarstone Ltd.Techno Quartz Inc.
Casio Computer Co., Ltd.AGC, Inc. (Japan)Citizen Watch Co., Ltd.LX Hausys Ltd.Swatch AGNihon Dempa Kogyo Co., Ltd.Miyazaki Epson Corp.Elkem ASARolex SAHeraeus Quarzglas GmbH & Co. KGShin-Etsu Quartz Products Co., Ltd.Daishinku Corp.Bulgari SpAChina Triumph International Engineering Co., Ltd.China Triumph International Engineering Co., Ltd.Patek Philippe SAMomentive Performance Materials Japan LLCNippon Kasei Chemical Co., Ltd.Imerys Minerals Ltd.SK EnpulseKinik Co.Tissot SACambria Co. LLCDolce & Gabbana SRLFujian Reida Precision Co., Ltd.Dolce & Gabbana SRLSaint Gobain Industrial Ceramics, Inc.MARUWA CO., LTD.Japan Super Quartz Corp.SHOWA SHINKU CO., LTD.