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US3328868A
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Method for manufacture of single or multicompartment pipes
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US3208138A
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Method and apparatus for adjusting the welding-gap width in a helicalseam tube-making installation
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GB951570A
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Improvements in or relating to helical seam pipe mills
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GB944003A
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Improvements in or relating to the manufacture of helical seam pipes
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GB954340A
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Improvements in helical seam pipe mills
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US3192749A
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Control mechanism for feeding strip stock to a helical seam pipe making machine
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FR1309056A
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Multi-chamber hollow body such as a boiler, tube or the like and method of making such a hollow body with strips
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CA699617A
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Helical seam pipe mill
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CA674598A
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Pipe welding controlling method and apparatus
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CA683493A
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Spirally seamed pipe with helical internal web
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