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Priority claimed from JP60238495Aexternal-prioritypatent/JPH0645883B2/en
Priority claimed from JP60238902Aexternal-prioritypatent/JPH0647729B2/en
Application filed by Canon KkfiledCriticalCanon Kk
Priority claimed from EP86308272Aexternal-prioritypatent/EP0264505B1/en
Application grantedgrantedCritical
Publication of ATE62939T1publicationCriticalpatent/ATE62939T1/en