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on concrete pipe manufacturing process in botswana

on concrete pipe manufacturing process in botswana

A process for manufacturing concrete pipes or the like by centrifugal casting comprising the steps of casting an outer layer in a rotary mold compressing a metal cylinder split longitudinally so that its diameter will be smaller than the diameter of said outer layer inserting said compressed cylinder within said outer layer spinning the mold to expand the slit metal core and compact the concrete and

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