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Priority claimed from PCT/US1984/000507external-prioritypatent/WO1984004130A1/en
Application filed by Hydril CofiledCriticalHydril Co
Publication of NO845058LpublicationCriticalpatent/NO845058L/en
Publication of NO169913BpublicationCriticalpatent/NO169913B/en
Publication of NO169913CpublicationCriticalpatent/NO169913C/en