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Priority claimed from DE3809697Aexternal-prioritypatent/DE3809697A1/en
Priority claimed from DE8815259Uexternal-prioritypatent/DE8815259U1/de
Application filed by Franz PreinfiledCriticalFranz Prein
Application grantedgrantedCritical
Publication of ATE72921T1publicationCriticalpatent/ATE72921T1/en