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Priority claimed from DE19732311732external-prioritypatent/DE2311732B2/en
Application filed by Petzetakis George AfiledCriticalPetzetakis George A
Priority to DK35878ApriorityCriticalpatent/DK140425C/en
Publication of DK35878ApublicationCriticalpatent/DK35878A/en
Publication of DK140425BpublicationCriticalpatent/DK140425B/en
Application grantedgrantedCritical
Publication of DK140425CpublicationCriticalpatent/DK140425C/en
DK35878A1972-11-291978-01-25
PROCEDURE AND APPARATUS FOR STRESS PRESSURE OF A FORMAL PREPARATION OF TWO LAYERS WITH INTERMEDIATE REINFORCEMENT
DK140425C
(en)
A method of making pipes with at least one tubular layer of foam plastic between two tubular cladding layers and an apparatus for carrying out the method.