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Priority claimed from US06/483,603external-prioritypatent/US4534673A/en
Priority claimed from US06/505,382external-prioritypatent/US4521129A/en
Application filed by Minnesota Mining & MfgfiledCriticalMinnesota Mining & Mfg
Priority claimed from EP88100848Aexternal-prioritypatent/EP0279204B1/en
Application grantedgrantedCritical
Publication of ATE66509T1publicationCriticalpatent/ATE66509T1/en