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Priority to JP46031815ApriorityCriticalpatent/JPS5248434B1/ja
Priority to DE19722221139prioritypatent/DE2221139B2/de
Priority to GB2196072Aprioritypatent/GB1396038A/en
Priority to NL7206289Aprioritypatent/NL7206289A/xx
Publication of JPS5248434B1publicationCriticalpatent/JPS5248434B1/ja