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TORICH GB/T3639-2009 EN10305-1 2002 Steel Tubing for Cylinders Hydraulic Pipes Standard : GB/T3639, GB/T8713, EN10305-1:2002, EN10305-2:2002, ASTM A519-2006, ASTM A513-2007, GB/T1591-2008, GB/T17396...