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Priority claimed from DE8707220Uexternal-prioritypatent/DE8707220U1/en
Priority claimed from DE3805066Aexternal-prioritypatent/DE3805066A1/en
Application filed by Emil GrumbachfiledCriticalEmil Grumbach
Priority claimed from EP19880105071external-prioritypatent/EP0291669B1/en
Application grantedgrantedCritical
Publication of ATE66586T1publicationCriticalpatent/ATE66586T1/en