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Priority claimed from DE19792942747external-prioritypatent/DE2942747C2/de
Priority claimed from DE19803014350external-prioritypatent/DE3014350C2/de
Application filed by Scantron Gmbh & Co. Elektronische Lesegeraete KgfiledCriticalScantron Gmbh & Co. Elektronische Lesegeraete Kg
Priority claimed from EP80106070Aexternal-prioritypatent/EP0027594B1/de
Application grantedgrantedCritical
Publication of ATE7427T1publicationCriticalpatent/ATE7427T1/de