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Document Designation and Title Year Select Item(s) B543 Standard Specification for Welded Copper and Copper-Alloy Heat Exchanger Tube 07e1 B543 Standard Specification for Welded Copper and Copper-Alloy Heat Exchanger Tube 07 B543 Standard Specification for Welded Copper and Copper-Alloy Heat Exchanger Tube 96(2003) B543 Standard Specification for Welded Copper and Copper-Alloy Heat Exchanger Tube 96e1 B543 Standard Specification for Welded Copper and Copper-Alloy Heat Exchanger Tube 96