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Priority to JP7209177UpriorityCriticalpatent/JPS5549349Y2/ja
Priority to GB50397/77Aprioritypatent/GB1582850A/en
Priority to US05/858,085prioritypatent/US4307814A/en
Publication of JPS53166107UpublicationCriticalpatent/JPS53166107U/ja
Application grantedgrantedCritical
Publication of JPS5549349Y2publicationCriticalpatent/JPS5549349Y2/ja