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Priority to JP13686480UpriorityCriticalpatent/JPS6116430Y2/ja
Priority to US06/254,591prioritypatent/US4511023A/en
Priority to CA000375866Aprioritypatent/CA1196300A/en
Publication of JPS5759227UpublicationCriticalpatent/JPS5759227U/ja
Application grantedgrantedCritical
Publication of JPS6116430Y2publicationCriticalpatent/JPS6116430Y2/ja