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Shandong China Coal Industrial & Mining Supplies Group Co., Ltd.
Qingdao Tlead International Co., Ltd.
Huazheng Electric Manufacturing (Baoding) Co., Ltd.
Fuzhou DIT Industry & Trade Co., Ltd.
Nanjing Kejie Analytical Instrument Co., Ltd.
Shenzhen Security Electronic Equipment Co., Ltd.
Jinan Handa Electron Technology Co., Ltd.
Nanjing T-Bota Scietech Instruments & Equipment Co., Ltd.
Liaoning Huake Petroleum Apparatus Science & Technology Co., Ltd.
Labmen Instrument Limited
Wincom Company Ltd.
Shanghai Drawell Scientific Instrument Co., Ltd.
TRYTE TECHNOLOGY (HUNAN) DEVELOPMENT CO., LTD.