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Priority to JP18518380UpriorityCriticalpatent/JPS6135793Y2/ja
Priority to US06/319,588prioritypatent/US4480726A/en
Priority to GB8135080Aprioritypatent/GB2090635B/en
Publication of JPS57107029UpublicationCriticalpatent/JPS57107029U/ja
Application grantedgrantedCritical
Publication of JPS6135793Y2publicationCriticalpatent/JPS6135793Y2/ja