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Unitary one quarter mile long railroad rail free of weld seams
Unitary one quarter mile long railroad rail free of weld seams
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机译:单一四分之一英里长的铁轨,无焊缝
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摘要
A unitary one-quarter mile long railroad rail which is free of weld seams. The rail is produced via a process including continuous rolling and asymmetric cooling.
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