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Beijing Topsky Century Holding Co., Ltd.
Huazheng Electric Manufacturing (Baoding) Co., Ltd.
Shanghai Boqu Instrument Co., Ltd.
Qingdao Tlead International Co., Ltd.
Shanghai Drawell Scientific Instrument Co., Ltd.
Xi'an Heb Biotechnology Co., Ltd.
Shandong China Coal Industrial & Mining Supplies Group Co., Ltd.
Nengshi Analytical Sensor Co., Ltd.
Nanjing Kejie Analytical Instrument Co., Ltd.
Changzhou Andwin International Corporation Limited
Q-Ying Plastic & Electronic (Shenzhen) Co., Ltd.
Liaoning Huake Petroleum Apparatus Science & Technology Co., Ltd.
Shandong Dongrun Instrument Science and Technology Co., Ltd.
Wincom Company Ltd.