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Priority to JP7269070UpriorityCriticalpatent/JPS5037851Y1/ja
Priority to US00128757Aprioritypatent/US3749392A/en
Priority to DE2116248Aprioritypatent/DE2116248C3/de
Priority to GB23827/71Aprioritypatent/GB1278396A/en
Publication of JPS5037851Y1publicationCriticalpatent/JPS5037851Y1/ja