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 PCT/US1984/000013external-prioritypatent/WO1984002949A1/en
Application filed by Hydril CofiledCriticalHydril Co
Publication of NO843647LpublicationCriticalpatent/NO843647L/en
Publication of NO165651BpublicationCriticalpatent/NO165651B/en
Publication of NO165651CpublicationCriticalpatent/NO165651C/en