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Priority claimed from US07/047,006external-prioritypatent/US4841958A/en
Priority claimed from US07/053,098external-prioritypatent/US4856502A/en
Application filed by Minnesota Mining & MfgfiledCriticalMinnesota Mining & Mfg
Application grantedgrantedCritical
Publication of ATE85512T1publicationCriticalpatent/ATE85512T1/en