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Priority claimed from US06/738,743external-prioritypatent/US4676903A/en
Application filed by Ahlstroem OyfiledCriticalAhlstroem Oy
Priority claimed from EP19860903389external-prioritypatent/EP0261117B1/de
Application grantedgrantedCritical
Publication of ATE62945T1publicationCriticalpatent/ATE62945T1/de