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DK97975A1975-03-111975-03-11Fremgangsmåde til fremstilling af cylindriske rør af papir med et indre, væsketæt lag af plastfolie samt et apparat til udøvelse af fremgangsmåden.
DK140974B
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Spiralviklet hylse, fremgangsmaate for fremstilling av hylsen, fremgangsmaate for anvendelse av hylsen i et vikleapparat og anordning for bruk av hylsen