EG11746A - A process and device for the manufacture of double-walled plastics pipes with their external wall provided with annular or helical grooves
- Google Patents
A process and device for the manufacture of double-walled plastics pipes with their external wall provided with annular or helical grooves
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Publication number
EG11746A
EG11746AEG14675AEG14675AEG11746AEG 11746 AEG11746 AEG 11746AEG 14675 AEG14675 AEG 14675AEG 14675 AEG14675 AEG 14675AEG 11746 AEG11746 AEG 11746A
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Priority claimed from DE2413879Aexternal-prioritypatent/DE2413879C3/de
Priority claimed from DE2413878Aexternal-prioritypatent/DE2413878C3/de
Application filed by Hegler WilhelmfiledCriticalHegler Wilhelm
Application grantedgrantedCritical
Publication of EG11746ApublicationCriticalpatent/EG11746A/xx
EG14675A1974-03-221975-03-22A process and device for the manufacture of double-walled plastics pipes with their external wall provided with annular or helical grooves
EG11746A
(en)
Verfahren zum Herstellen eines doppelwandigen Kunststoffrohrs mit gewellter Außen- und glatter Innenwand und Vorrichtung zur Durchführung dieses Verfahrens