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GB417637A
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Improvements relating to high pressure pipe joints
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GB403589A
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Improvements in ball and socket joints for pipes
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GB397440A
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Improvements in and relating to welded joints for hollow metal bodies, particularly pipe joints
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DE647885C
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Self-sealing pipe connection with flanges, collars or the like.
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DE602695C
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Adjustable, flexible, iron pit die
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DE631843C
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Welded connection for hollow bodies accessible from the inside
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GB378325A
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Improvements in or relating to welded spigot-and-socket pipe joints
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DE570746C
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Water separator for gas pipelines
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DE594164C
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High pressure socket connection with gland seal
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