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Priority claimed from GB868629158Aexternal-prioritypatent/GB8629158D0/en
Application filed by Bt & D Technologies LtdfiledCriticalBt & D Technologies Ltd
Priority claimed from EP19870310670external-prioritypatent/EP0274222B1/en
Application grantedgrantedCritical
Publication of ATE86390T1publicationCriticalpatent/ATE86390T1/en