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Priority to JP6811476UpriorityCriticalpatent/JPS52158461U/ja
Priority to DE19772759581prioritypatent/DE2759581C3/de
Priority to DE19772723869prioritypatent/DE2723869C2/de
Priority to GB2223577Aprioritypatent/GB1582796A/en
Publication of JPS52158461UpublicationCriticalpatent/JPS52158461U/ja