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Priority claimed from JP60159736Aexternal-prioritypatent/JPH0785352B2/en
Priority claimed from JP60161438Aexternal-prioritypatent/JP2708740B2/en
Application filed by Sony CorpfiledCriticalSony Corp
Priority claimed from EP86109894Aexternal-prioritypatent/EP0209151B1/en
Application grantedgrantedCritical
Publication of ATE58610T1publicationCriticalpatent/ATE58610T1/en