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Priority claimed from BE0/216128Aexternal-prioritypatent/BE904029A/en
Priority claimed from BE0/216136Aexternal-prioritypatent/BE904041A/en
Application filed by Joskin EtsfiledCriticalJoskin Ets
Priority claimed from EP19870870003external-prioritypatent/EP0233167B1/en
Application grantedgrantedCritical
Publication of ATE65224T1publicationCriticalpatent/ATE65224T1/en