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Jinan Handa Electron Technology Co., Ltd.
Huazheng Electric Manufacturing (Baoding) Co., Ltd.
Hangzhou Altrasonic Technology Co.,Ltd
Shandong Dongrun Instrument Science and Technology Co., Ltd.
Shanghai Drawell Scientific Instrument Co., Ltd.
Nengshi Analytical Sensor Co., Ltd.
Liaoning Huake Petroleum Apparatus Science & Technology Co., Ltd.
Nanjing Kejie Analytical Instrument Co., Ltd.
Beijing Topsky Century Holding Co., Ltd.
Qingdao Tlead International Co., Ltd.
Chongqing Gold Mechanical & Electrical Equipment Co., Ltd.
Wincom Company Ltd.