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Priority claimed from DE3310304Aexternal-prioritypatent/DE3310304C2/en
Application filed by Walter AgfiledCriticalWalter Ag
Priority claimed from EP83109111Aexternal-prioritypatent/EP0103852B1/en
Application grantedgrantedCritical
Publication of ATE20127T1publicationCriticalpatent/ATE20127T1/en