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Priority claimed from GB878701356Aexternal-prioritypatent/GB8701356D0/en
Priority claimed from GB878710217Aexternal-prioritypatent/GB8710217D0/en
Application filed by John BarberfiledCriticalJohn Barber
Priority claimed from EP19880300519external-prioritypatent/EP0277733B1/de
Application grantedgrantedCritical
Publication of ATE74837T1publicationCriticalpatent/ATE74837T1/de