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Shandong China Coal Industrial & Mining Supplies Group Co., Ltd.
Yueqing Winston Electric Co., Ltd.
Changsha Taihe Electronic Equipment Co., Ltd.
Xinling Electrical Co., Ltd. China
Jiangyin Spark Electronic Technology Co., Ltd.
Xi'an Tosilon Automation Co., Ltd.
Micro Sensor Co., Ltd.
Hanzhong Quan Yuan Electronic Co., Ltd.
Yangzhou R & D Co., Ltd.