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Priority claimed from US06/202,582external-prioritypatent/US4382904A/en
Priority claimed from US06/202,581external-prioritypatent/US4337139A/en
Application filed by Eltech Systems CorpfiledCriticalEltech Systems Corp
Priority claimed from EP81305086Aexternal-prioritypatent/EP0052446B1/de
Application grantedgrantedCritical
Publication of ATE18535T1publicationCriticalpatent/ATE18535T1/de