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Priority claimed from CA000449923Aexternal-prioritypatent/CA1228986A/en
Priority claimed from US06/624,729external-prioritypatent/US4631860A/en
Application filed by Pcw Agra Tech LtdfiledCriticalPcw Agra Tech Ltd
Priority claimed from EP19850301680external-prioritypatent/EP0163371B1/en
Application grantedgrantedCritical
Publication of ATE46065T1publicationCriticalpatent/ATE46065T1/en