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Priority claimed from US05/950,633external-prioritypatent/US4228826A/en
Application filed by Frank Campbell, Jr.filedCriticalFrank Campbell, Jr.
Priority claimed from EP19790302116external-prioritypatent/EP0010385B1/de
Application grantedgrantedCritical
Publication of ATE6495T1publicationCriticalpatent/ATE6495T1/de