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Beijing Topsky Century Holding Co., Ltd.
Q-Ying Plastic & Electronic (Shenzhen) Co., Ltd.
Chongqing Gold Mechanical & Electrical Equipment Co., Ltd.
Nanjing Kejie Analytical Instrument Co., Ltd.
Nanjing T-Bota Scietech Instruments & Equipment Co., Ltd.
Shandong Dongrun Instrument Science and Technology Co., Ltd.
Huazheng Electric Manufacturing (Baoding) Co., Ltd.
Liaoning Huake Petroleum Apparatus Science & Technology Co., Ltd.
Zhejiang Scientific Instruments & Materials Import & Export Co., Ltd.
Shandong China Coal Industrial & Mining Supplies Group Co., Ltd.
Jinan Handa Electron Technology Co., Ltd.
Shanghai Boqu Instrument Co., Ltd.