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Priority to JP3507467ApriorityCriticalpatent/JPS494656B1/ja
Priority to GB568268Aprioritypatent/GB1221333A/en
Priority to GB1234655Dprioritypatent/GB1234655A/en
Priority to DE19681772518prioritypatent/DE1772518A1/de
Publication of JPS494656B1publicationCriticalpatent/JPS494656B1/ja