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GB794376A
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A method for making pipes of originally plastic hydraulically setting material gas and water tight, and a tube produced according to this method
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GB206446A
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Improvements in a method and a device for the production of hollow articles such as tubes, poles and the like from re-inforced concrete
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GB208958A
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Improvements in or relating to reinforced concrete pipes or like bodies
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US1103334A
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Method of producing well-holes, pole-holes, and the like.
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US1117737A
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Tool for producing well-holes, pole-holes, and the like.
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US1213441A
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Method of making concrete or reinforced-concrete (ferroconcrete) piles.
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CA235296A
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Moulding method and machine for pipes
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CA570109A
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Method to manufacture gas-and waterproof pipes of primary plastic and hydraulic moulded material, and pipes manufactured according this method
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CA214174A
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Manufacture of articles of cement
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