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Shenzhen Bonad Instrument Co., Ltd.
Nanjing Kehua Instrument & Meter Co., Ltd.
Ningbo Shunjay Instruments Co., Ltd.
Shandong China Coal Industrial & Mining Supplies Group Co., Ltd.
Yuyao Gongyi Meter Co., Ltd.
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Nanjing T-Bota Scietech Instruments & Equipment Co., Ltd.
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Nanjing Kejie Analytical Instrument Co., Ltd.