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TOBO International Trading(Shanghia)Co.,Ltd       Tianda Oil Pipe Co., Ltd

TOBO Pipeline Equipment Co.,Ltd        TPCO & TISCO Pipe(Tianjin)Co.,Ltd.                        

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April 13, 2022

ASTM A815 UNS S31803 Duplex Steel Seamless Pipes & Tubes Seamless Steel PIPE Alloy Steel 4" sch40

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