4. Pipes and tubular conduits
  5. Longitudinally seamed
  6. Sectional

Johnston Pipes Limited

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Lining or relining of tunnels

Hydraulic and earth engineering – Underground passageway – e.g. – tunnel – Lining
Patent

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Pipe, a method of constructing the pipe and a method of lining o

Pipes and tubular conduits – Longitudinally seamed – Sectional
Patent

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Sewer pipe structures and their method of construction

Pipes and tubular conduits – Plural duct – Longitudinally extending common wall
Reexamination Certificate

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