AU487687B2 - A process and device forthe manufacture of double-walled plastics pipes with their external wall provided with annular or helical grooves
- Google Patents
A process and device forthe manufacture of double-walled plastics pipes with their external wall provided with annular or helical grooves
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Priority claimed from DE2413878Aexternal-prioritypatent/DE2413878C3/en
Priority claimed from DE2413879Aexternal-prioritypatent/DE2413879C3/en
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Publication of AU7943675ApublicationCriticalpatent/AU7943675A/en
AU79436/75A1974-03-221975-03-24A process and device forthe manufacture of double-walled plastics pipes with their external wall provided with annular or helical grooves
ExpiredAU487687B2
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