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Priority to JP17519376UpriorityCriticalpatent/JPS5393248U/ja
Priority to GB5351777Aprioritypatent/GB1594975A/en
Priority to DE19772758464prioritypatent/DE2758464A1/de
Priority to DE19777739892prioritypatent/DE7739892U1/de
Publication of JPS5393248UpublicationCriticalpatent/JPS5393248U/ja