ASTM, ASME Pipe, Tube Standard, Seamless
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SPPS420-KS, STPG410-JIS Carbon Pipe for Pressure
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Brass and Gold Metal Comparison, 황금과 황동
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STPG38, STPG370, JIS Standard Carbon Steel Pipe
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All of the Round Pipe, Tube, Square, Rectangular
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Pipe and Tube, KS, New, Old Symbol Comparison
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