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Qingdao Tlead International Co., Ltd.
Nengshi Analytical Sensor Co., Ltd.
Shanghai Boqu Instrument Co., Ltd.
Nanjing Kejie Analytical Instrument Co., Ltd.
Shanghai Drawell Scientific Instrument Co., Ltd.
Huazheng Electric Manufacturing (Baoding) Co., Ltd.
Shandong China Coal Industrial & Mining Supplies Group Co., Ltd.
Fuzhou DIT Industry & Trade Co., Ltd.
Beijing Topsky Century Holding Co., Ltd.
Liaoning Huake Petroleum Apparatus Science & Technology Co., Ltd.
Q-Ying Plastic & Electronic (Shenzhen) Co., Ltd.