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Priority to JP12117679UpriorityCriticalpatent/JPS6020495Y2/ja
Priority to US06/168,787prioritypatent/US4357781A/en
Publication of JPS5639319UpublicationCriticalpatent/JPS5639319U/ja
Application grantedgrantedCritical
Publication of JPS6020495Y2publicationCriticalpatent/JPS6020495Y2/ja