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Priority to JP10177787UpriorityCriticalpatent/JPH0452047Y2/ja
Priority to US07/167,863prioritypatent/US4875960A/en
Priority to EP19880302201prioritypatent/EP0283229A3/en
Publication of JPS6422421UpublicationCriticalpatent/JPS6422421U/ja
Application grantedgrantedCritical
Publication of JPH0452047Y2publicationCriticalpatent/JPH0452047Y2/ja