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Shandong China Coal Industrial & Mining Supplies Group Co., Ltd.
Shanghai Drawell Scientific Instrument Co., Ltd.
Nengshi Analytical Sensor Co., Ltd.
Beijing Topsky Century Holding Co., Ltd.
Wincom Company Ltd.
Xi'an Tosilon Automation Co., Ltd.
Fuzhou DIT Industry & Trade Co., Ltd.
Q-Ying Plastic & Electronic (Shenzhen) Co., Ltd.
Chongqing Gold Mechanical & Electrical Equipment Co., Ltd.
Qingdao Tlead International Co., Ltd.
Nanjing Kejie Analytical Instrument Co., Ltd.