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Priority claimed from JP59211862Aexternal-prioritypatent/JPS6189608A/ja
Priority claimed from JP659985Aexternal-prioritypatent/JPS61167367A/ja
Application filed by Mitsubishi Mining & Cement Co, Iwasaki ElectronicsfiledCriticalMitsubishi Mining & Cement Co
Priority claimed from EP85904866Aexternal-prioritypatent/EP0198085B1/de
Application grantedgrantedCritical
Publication of ATE48048T1publicationCriticalpatent/ATE48048T1/de