Zhang Zhixin. NEW COMPOSITE PLUG USED FOR CROSS ROLL PIERCING[J]. STEEL PIPE, 1988, 17(4): 55-57.
    Citation: Zhang Zhixin. NEW COMPOSITE PLUG USED FOR CROSS ROLL PIERCING[J]. STEEL PIPE, 1988, 17(4): 55-57.

    NEW COMPOSITE PLUG USED FOR CROSS ROLL PIERCING

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