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Priority to JP1974061171UpriorityCriticalpatent/JPS5616639Y2/ja
Priority to US05/580,758prioritypatent/US3979990A/en
Publication of JPS50150319UpublicationCriticalpatent/JPS50150319U/ja
Application grantedgrantedCritical
Publication of JPS5616639Y2publicationCriticalpatent/JPS5616639Y2/ja