4. Metal deforming
  5. By tool-couple pressing together adjacent surface portions...
  6. To form helically-seamed tube

Scott E. Johnston

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Method and apparatus for arching large diameter pipes

Metal deforming – By relatively receding work-engaging tool-faces – Embodying three or more tools
Reexamination Certificate

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Method and apparatus for portable spiral pipe manufacturing

Metal deforming – By tool-couple pressing together adjacent surface portions... – To form helically-seamed tube
Patent

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Profile ID: LFUS-PAI-P-1048171

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