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Priority claimed from IT40019/82Aexternal-prioritypatent/IT1201019B/en
Priority claimed from IT40008/83Aexternal-prioritypatent/IT1172681B/en
Application filed by El SrlfiledCriticalEl Srl
Priority claimed from EP19830830047external-prioritypatent/EP0088735B1/en
Application grantedgrantedCritical
Publication of ATE21669T1publicationCriticalpatent/ATE21669T1/en