CA170741A
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Pipe reinforcement
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US1326594A
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Reinforcement for pipes and conduits.
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US1233239A
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Machine for manufacturing pipes, conduits, and the like.
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US1232316A
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Machine for making pipes and conduits.
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CA165305A
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Reinforcement for pipes
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CA161344A
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Machine for manufacturing pipes, etc.
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GB191321626A
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Improvements in and relating to Machines for Manufacturing Pipes, Conduits and the like.
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GB191321627A
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Improvements in Reinforcement for Concrete or similar Pipes, Conduits and the like, and Machines for Manufacturing the same.
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CA277473A
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Method of lining pipes
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CA305627A
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Manufacture of slabs, columns, etc., from concrete materials
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CA302222A
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Pipe joint
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CA258926A
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Apparatus for manufacturing concrete slabs
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CA291873A
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Pipe lining and moulding method and apparatus
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CA269538A
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Welding apparatus control device
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CA282793A
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Welding machine
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CA255892A
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Electric welding apparatus
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CA277648A
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Crushing or pulverizing mill
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CA255269A
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Manufacture of pipes
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CA307814A
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Electric welding apparatus
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CA322590A
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Welding rod
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