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Priority claimed from US06/202,576external-prioritypatent/US4379772A/en
Application filed by Eltech Systems CorpfiledCriticalEltech Systems Corp
Priority claimed from EP81305093Aexternal-prioritypatent/EP0051439B1/en
Application grantedgrantedCritical
Publication of ATE20092T1publicationCriticalpatent/ATE20092T1/en