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Priority to JP1979057155UpriorityCriticalpatent/JPS55157228U/ja
Priority to US06/079,598prioritypatent/US4315679A/en
Priority to DE19792942389prioritypatent/DE2942389A1/de
Publication of JPS55157228UpublicationCriticalpatent/JPS55157228U/ja
Priority to US06/505,024prioritypatent/US4449802A/en