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Qingdao Tlead International Co., Ltd.
Liaoning Huake Petroleum Apparatus Science & Technology Co., Ltd.
Beijing Topsky Century Holding Co., Ltd.
Nanjing Kejie Analytical Instrument Co., Ltd.
Zhejiang Scientific Instruments & Materials Import & Export Co., Ltd.
Nengshi Analytical Sensor Co., Ltd.
Shanghai Drawell Scientific Instrument Co., Ltd.
Deson Electric Group Company Limited
Jinan Handa Electron Technology Co., Ltd.
Zhuhai City Deyuan Import & Export Co., Ltd.
Fuzhou DIT Industry & Trade Co., Ltd.