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US1286056A
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Means or apparatus relating to the manufacture, centrifugally, of hollow articles.
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US1223602A
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Manufacture, centrifugally, of hollow articles.
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GB191512928A
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Improvements in or relating to the Manufacture, Centrifugally, of Pipes, Columns and other Hollow Articles.
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CA252451A
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Manufacture centrifugally of pipes, etc.
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CA240675A
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Manufacture of pipes, columns, etc.
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CA240676A
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Manufacture of pipes, columns, etc.
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CA244439A
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Pipe joint
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CA263854A
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Pipe and column manufacture
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CA252452A
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Means for the lining or manufacture centrifugally of pipes, etc.
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