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Priority claimed from US06/488,633external-prioritypatent/US4537429A/en
Priority claimed from PCT/US1984/000520external-prioritypatent/WO1984004352A1/en
Application filed by Hydril CofiledCriticalHydril Co
Publication of DK615884ApublicationCriticalpatent/DK615884A/da
Publication of DK615884D0publicationCriticalpatent/DK615884D0/da