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US2061105A
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Method and device for reenforcing articles and structures made from concrete and the like
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GB464279A
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Method of and means for reinforcing pipes and the like made from concrete and the like
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US2008339A
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Manufacture and joining of articles of concrete and the like
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GB367051A
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Improvements in and relating to the manufacture of articles of concrete and the like
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Process and apparatus for the moulding of concrete articles of all kinds
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Improved process for the production of pipes and the like from reinforced concrete
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