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Priority to JP1980053894UpriorityCriticalpatent/JPH0219770Y2/ja
Priority to US06/255,219prioritypatent/US4392716A/en
Priority to DE3116035Aprioritypatent/DE3116035C2/de
Publication of JPS56156013UpublicationCriticalpatent/JPS56156013U/ja
Application grantedgrantedCritical
Publication of JPH0219770Y2publicationCriticalpatent/JPH0219770Y2/ja