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Priority to JP1974052483UpriorityCriticalpatent/JPS5639810Y2/ja
Priority to US05/575,696prioritypatent/US4028951A/en
Publication of JPS50139875UpublicationCriticalpatent/JPS50139875U/ja
Application grantedgrantedCritical
Publication of JPS5639810Y2publicationCriticalpatent/JPS5639810Y2/ja