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Priority claimed from DE3617817Aexternal-prioritypatent/DE3617817C2/de
Application filed by Avk Filtertechnik GmbhfiledCriticalAvk Filtertechnik Gmbh
Priority claimed from EP87105457Aexternal-prioritypatent/EP0248174B1/de
Application grantedgrantedCritical
Publication of ATE64689T1publicationCriticalpatent/ATE64689T1/de