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US2283735A
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Centrifugal concrete pipe molding machine
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Rubber ring pipe joint
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Manufacture of concrete pipes and like bodies
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Improvements relating to the centrifugal moulding of concrete pipes
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Molding of concrete pipes and the like
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Centrifugal molding and lining of pipes and the like
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Centrifugal molding of concrete bodies
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Improvements relating to the manufacture of concrete slabs and the like
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Improvements relating to pipe joints
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Pipe joint
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Centrifugal concrete moulding apparatus
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Concrete slab moulding apparatus
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Centrifugal moulding apparatus for concrete pipes
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Pipe coating and manufacturing method
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