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Priority claimed from JP1031408Aexternal-prioritypatent/JP2810395B2/en
Priority claimed from JP1031405Aexternal-prioritypatent/JP2683084B2/en
Priority claimed from JP1031404Aexternal-prioritypatent/JPH02210959A/en
Application filed by Canon KkfiledCriticalCanon Kk
Publication of SG72673A1publicationCriticalpatent/SG72673A1/en