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Priority claimed from GB868630218Aexternal-prioritypatent/GB8630218D0/en
Priority claimed from GB878726454Aexternal-prioritypatent/GB8726454D0/en
Application filed by Michael Anthony Smithard, Treadwell Shirley AnnefiledCriticalMichael Anthony Smithard
Priority claimed from EP87311017Aexternal-prioritypatent/EP0275665B1/de
Application grantedgrantedCritical
Publication of ATE86872T1publicationCriticalpatent/ATE86872T1/de