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Priority claimed from JP1974067257Uexternal-prioritypatent/JPS5257244Y2/ja
Priority claimed from JP7397974Uexternal-prioritypatent/JPS5248217Y2/ja
Priority claimed from JP7198974Aexternal-prioritypatent/JPS5230621B2/ja
Priority claimed from JP15022674Uexternal-prioritypatent/JPS5437878Y2/ja
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Publication of DD121529A5publicationCriticalpatent/DD121529A5/xx