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Priority to JP16604377UpriorityCriticalpatent/JPS577285Y2/ja
Priority to US05/952,989prioritypatent/US4237586A/en
Publication of JPS5491931UpublicationCriticalpatent/JPS5491931U/ja
Application grantedgrantedCritical
Publication of JPS577285Y2publicationCriticalpatent/JPS577285Y2/ja