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GB542185A
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Improvements in or relating to machines for making pipes or sheets from plastic material
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GB507618A
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Improvements in sleepers for railways, tramways and the like
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DE661385C
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Metal-reinforced railway sleeper composed of fiber panels
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GB466155A
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Improvements in sleepers for railways, tramways and the like
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GB450906A
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Improvements in lead-packed couplings for pipe lines
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GB447094A
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Improvements in lead-packed couplings for pipe lines
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GB240142A
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Improvements relating to the manufacture of seamless tubes
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GB225543A
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Improvements in the manufacture of seamless pipes
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DE471659C
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Method and device for the production of seamless tubes from fiber and binding agents, e.g. B. Asbestos and cement
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GB147025A
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Process of and apparatus for the manufacture of weldless tubes
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