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7YRSGuangdong Haiyouda Intelligent Technology Co., Ltd.
UL/FM standard ASTM A53 A106 ERW Galvanized Steel Tube
7YRSTianjin Youfa International Trade Co., Ltd.
SHENSHI UL certification new product shell and tube heat exchanger
10YRSHangzhou Shenshi Energy Conservation Technology Co., Ltd.
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