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Fuzhou DIT Industry & Trade Co., Ltd.
Beijing Topsky Century Holding Co., Ltd.
Jinan Handa Electron Technology Co., Ltd.
Nanjing Kejie Analytical Instrument Co., Ltd.
Nengshi Analytical Sensor Co., Ltd.
Shanghai Drawell Scientific Instrument Co., Ltd.
Nanjing T-Bota Scietech Instruments & Equipment Co., Ltd.
Liaoning Huake Petroleum Apparatus Science & Technology Co., Ltd.
Huazheng Electric Manufacturing (Baoding) Co., Ltd.