4. Plastic article or earthenware shaping or treating: apparatus
  5. Preform assembly means and means for bonding of plural...
  6. Reshaping means utilizing fluid pressure directly contacting...

Contech Construction Products Inc.

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Apparatus for producing double wall pipe

Plastic article or earthenware shaping or treating: apparatus – Preform assembly means and means for bonding of plural... – Reshaping means utilizing fluid pressure directly contacting...
Patent

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Apparatus for producing helically corrugated metal pipe and...

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

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Apparatus for producing helically corrugated metal pipe and...

Metal deforming – By use of 'flying tool' engaging moving work – Included in plural deforming stations or passes
Reexamination Certificate

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Coupling for spiral corrugated pipe

Pipe joints or couplings – Serial,relatively movable portions – Serial diverse single flow path or line
Patent

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Gasket for making joints in corrugated plastic pipe

Pipe joints or couplings – Flexible joint – rigid members – Socketed packing type
Patent

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