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.)
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Publication date
Priority claimed from US06/458,733external-prioritypatent/US4570982A/en
Priority claimed from PCT/US1984/000038external-prioritypatent/WO1984002947A1/en
Application filed by Hydril CofiledCriticalHydril Co
Publication of NO843648LpublicationCriticalpatent/NO843648L/no
Publication of NO166892BpublicationCriticalpatent/NO166892B/no
Publication of NO166892CpublicationCriticalpatent/NO166892C/no