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Priority claimed from IT20819/88Aexternal-prioritypatent/IT1217751B/en
Priority claimed from IT8920536Aexternal-prioritypatent/IT1229751B/en
Application filed by Gtf SrlfiledCriticalGtf Srl
Priority claimed from EP19890109470external-prioritypatent/EP0344620B1/en
Application grantedgrantedCritical
Publication of ATE98845T1publicationCriticalpatent/ATE98845T1/en