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Priority claimed from US06/439,085external-prioritypatent/US4453630A/en
Application filed by Patent Dev International LtdfiledCriticalPatent Dev International Ltd
Priority claimed from EP83306698Aexternal-prioritypatent/EP0108614B1/en
Application grantedgrantedCritical
Publication of ATE24695T1publicationCriticalpatent/ATE24695T1/en