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Priority claimed from GB7925684Aexternal-prioritypatent/GB2030857B/en
Application filed by Ernst SpirigfiledCriticalErnst Spirig
Priority claimed from EP79301817Aexternal-prioritypatent/EP0009891B1/de
Application grantedgrantedCritical
Publication of ATE1596T1publicationCriticalpatent/ATE1596T1/de