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Priority to JP11967172UpriorityCriticalpatent/JPS5228251Y2/ja
Priority to US38407973prioritypatent/US3914482A/en
Publication of JPS4974619UpublicationCriticalpatent/JPS4974619U/ja
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Publication of JPS5228251Y2publicationCriticalpatent/JPS5228251Y2/ja