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Priority to JP1976048329UpriorityCriticalpatent/JPS5943564Y2/ja
Priority to GB1542977Aprioritypatent/GB1570967A/en
Priority to DE19772716759prioritypatent/DE2716759A1/de
Publication of JPS52138731UpublicationCriticalpatent/JPS52138731U/ja
Application grantedgrantedCritical
Publication of JPS5943564Y2publicationCriticalpatent/JPS5943564Y2/ja