4. Pipes and tubular conduits
  5. Spirally seamed

Protol A.G.

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Clinching roller

Machines not elsewhere specified – Material working – abrading – or founding machinery – Deforming or crushing
Patent

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Helically wound lock seam tube

Pipes and tubular conduits – Flexible – Spirally wound material
Reexamination Certificate

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Helically wound lock-seam tube

Environmental heating and cooling; fluid handling and sanitary e – Fluid handling or treatment equipment – Fitting
Patent

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Helically wound lock-seam tube

Pipes and tubular conduits – Spirally seamed
Patent

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Helically wound lock-seam tube

Pipes and tubular conduits – Spirally seamed
Reexamination Certificate

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