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Priority claimed from US06/567,738external-prioritypatent/US4525616A/en
Application filed by Evans Pipeline Equip CofiledCriticalEvans Pipeline Equip Co
Publication of NO853443LpublicationCriticalpatent/NO853443L/en
Publication of NO167717BpublicationCriticalpatent/NO167717B/en
Publication of NO167717CpublicationCriticalpatent/NO167717C/en