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Priority to JP11825277UpriorityCriticalpatent/JPS5444980U/ja
Priority to DE2815815Aprioritypatent/DE2815815C3/de
Priority to GB15049/78Aprioritypatent/GB1579906A/en
Priority to US05/897,638prioritypatent/US4186285A/en
Publication of JPS5444980UpublicationCriticalpatent/JPS5444980U/ja