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Priority to JP1971010048UpriorityCriticalpatent/JPS518208Y2/ja
Priority to DE19712159827prioritypatent/DE2159827C3/de
Priority to GB5624771Aprioritypatent/GB1360643A/en
Publication of JPS4721250UpublicationCriticalpatent/JPS4721250U/ja
Application grantedgrantedCritical
Publication of JPS518208Y2publicationCriticalpatent/JPS518208Y2/ja