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Method for forming electric welded pipe
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Tube mill and method of manufacture of thin walled tubing
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Apparatus for manufacturing electric welded pipes under hot conditions
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Method for forming an electric resistance welded steel pipe
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Methods and apparatus for welding sheet material
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Apparatus and method for forming helically welded tubing
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Apparatus for making seam welded tubing
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Improvement in machines for making metallic tubing |
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Apparatus for forming tubular blanks
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Method of forming rings and couplings.
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Способ изготовлени многослойной спиральношовной трубы
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Machine for making welded tubing
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電縫鋼管の製造方法
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Способ изготовлени электросварных пр мошовных труб
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