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Individual
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Priority to ES0062749UpriorityCriticalpatent/ES62749Y/en
Publication of ES62749UpublicationCriticalpatent/ES62749U/en
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Publication of ES62749YpublicationCriticalpatent/ES62749Y/en
Tube for pipes with air chamber, characterized essentially by the fact that it consists of a metal tube with a coating of plastic material, which does not rest directly on it, but internally presents a plurality of projections that act as spacers between both tubes are therefore between the metal tube and its plastic coating air chambers that significantly improve the isolation of the same, since there is minimal contact between them. (Machine-translation by Google Translate, not legally binding)
ES0062749U1957-11-061957-11-06
Tube for pipes with air chamber
ExpiredES62749Y
(en)