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
Info
Publication number
EG11746A
EG11746AEG14675AEG14675AEG11746AEG 11746 AEG11746 AEG 11746AEG 14675 AEG14675 AEG 14675AEG 14675 AEG14675 AEG 14675AEG 11746 AEG11746 AEG 11746A
Authority
EG
Egypt
Prior art keywords
annular
manufacture
double
external wall
wall provided
Prior art date
Application number
EG14675A
Inventor
R Hegler
W Hegler
Original Assignee
Hegler Wilhelm
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE2413878Aexternal-prioritypatent/DE2413878C3/en
Priority claimed from DE2413879Aexternal-prioritypatent/DE2413879C3/en
Application filed by Hegler WilhelmfiledCriticalHegler Wilhelm
Application grantedgrantedCritical
Publication of EG11746ApublicationCriticalpatent/EG11746A/en
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)