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Priority claimed from US06/286,161external-prioritypatent/US4397308A/en
Priority claimed from US06/367,598external-prioritypatent/US4485808A/en
Application filed by George R HepburnfiledCriticalGeorge R Hepburn
Priority claimed from EP82902621Aexternal-prioritypatent/EP0084561B1/de
Application grantedgrantedCritical
Publication of ATE44228T1publicationCriticalpatent/ATE44228T1/de