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DOUBLE-LAYERED TUBE
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Pipe for conveying solid matter
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Curved cast-iron pipe
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Method for the production of tubes
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Method for the production of a double-walled tube for conveying solids
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Method for the production of a double-walled tube for conveying solids
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Method and apparatus for the production of a double-walled pipe for carrying solids
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Device for the internal hardening of tubes
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Process for flame-hardening of the inner pipe of a double-layer pipe
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Device for flame-hardening the internal surface of a pipe
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Process for producing a welding neck for solids transportation pipes as well as a welding neck for such pipes
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