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Priority claimed from GB848419312Aexternal-prioritypatent/GB8419312D0/en
Priority claimed from GB858504187Aexternal-prioritypatent/GB8504187D0/en
Application filed by Contra Vision LtdfiledCriticalContra Vision Ltd
Priority claimed from EP85305127Aexternal-prioritypatent/EP0170472B1/en
Application grantedgrantedCritical
Publication of ATE48396T1publicationCriticalpatent/ATE48396T1/en