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Beijing Topsky Century Holding Co., Ltd.
Shanghai Drawell Scientific Instrument Co., Ltd.
Liaoning Huake Petroleum Apparatus Science & Technology Co., Ltd.
Jinan Handa Electron Technology Co., Ltd.
Nanjing T-Bota Scietech Instruments & Equipment Co., Ltd.
Nengshi Analytical Sensor Co., Ltd.
Changzhou Andwin International Corporation Limited
Huazheng Electric Manufacturing (Baoding) Co., Ltd.
Shenzhen Hanhu Industrial Co.,Ltd
Deson Electric Group Company Limited
Hangzhou Lohand Biological Co., Ltd.
Shandong China Coal Industrial & Mining Supplies Group Co., Ltd.
Nanjing Kejie Analytical Instrument Co., Ltd.
Q-Ying Plastic & Electronic (Shenzhen) Co., Ltd.
Labmen Instrument Limited
Wincom Company Ltd.