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METHOD OF PREWELDING PREPARATION OF LAP JOINT
METHOD OF PREWELDING PREPARATION OF LAP JOINT
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机译:搭接接头的预焊方法
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摘要
the invention касаетс welding and can be used in the repair and rehabilitation work in the pipeline to re - static internal workers blood pressure ием.the purpose of изобретени - повьшение reliabili
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