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Priority claimed from US06/520,412external-prioritypatent/US4492880A/en
Application filed by Parker Mfg CofiledCriticalParker Mfg Co
Publication of NO851322LpublicationCriticalpatent/NO851322L/no
Publication of NO168148BpublicationCriticalpatent/NO168148B/no
Publication of NO168148CpublicationCriticalpatent/NO168148C/no