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Priority to JP6953577UpriorityCriticalpatent/JPS53164138U/ja
Priority to US05/906,802prioritypatent/US4440403A/en
Priority to GB21585/78Aprioritypatent/GB1575788A/en
Priority to DE2823605Aprioritypatent/DE2823605C3/de
Publication of JPS53164138UpublicationCriticalpatent/JPS53164138U/ja