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Individual
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Priority to ES0254452ApriorityCriticalpatent/ES254452A1/en
Publication of ES254452A1publicationCriticalpatent/ES254452A1/en
A new method for the production of composite tubes, characterized, essentially, by pressurizing at least one of the internal and/or external walls of an advantageously metallic tube, with at least one second tube, of material, preferably of lesser thickness. Hardness, for which, both tubes are passed under pressure by a row and if necessary hammer together to ensure their solidarity, proceeding in this way successively with one or more tubes to obtain the required wall thickness. (Machine-translation by Google Translate, not legally binding)
ES0254452A1959-12-241959-12-24New method for the production of compound pipes (Machine-translation by Google Translate, not legally binding)
ExpiredES254452A1
(en)
A new procedure for the manufacture of concrete pipes with precompressed or pretensed duels (Machine-translation by Google Translate, not legally binding)
Interchanging apparatus between gases, applicable in refrigeration systems for refrigerators (Machine-translation by Google Translate, not legally binding)
A procedure for the manufacture of flexible paper pipes, especially tubes for installations (Machine-translation by Google Translate, not legally binding)