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Q-Ying Plastic & Electronic (Shenzhen) Co., Ltd.
Nengshi Analytical Sensor Co., Ltd.
Shandong China Coal Industrial & Mining Supplies Group Co., Ltd.
Beijing Topsky Century Holding Co., Ltd.
Qingdao Tlead International Co., Ltd.
Labmen Instrument Limited
Shanghai Boqu Instrument Co., Ltd.
Huazheng Electric Manufacturing (Baoding) Co., Ltd.
Wincom Company Ltd.
Liaoning Huake Petroleum Apparatus Science & Technology Co., Ltd.