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Guangzhou Yihua Electronic Equipment Co., Ltd.
Qidong Perfect Precise Tools Co., Ltd.
GIAI PHOTONICS CO., LTD.
Shijiazhuang Zeyuan Optics Co., Ltd.
OPTECK MANUFACTURING GROUP LTD.
Shenzhen Chuangxin Instruments CO., LTD.
Nanjing Poweam Medical Co., Ltd.