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Application filed by 미네소타 마이닝 앤드 매뉴팩츄어링 컴패니filedCritical미네소타 마이닝 앤드 매뉴팩츄어링 컴패니
Priority to KR1019900000504ApriorityCriticalpatent/KR0144573B1/en
Publication of KR900011442ApublicationCriticalpatent/KR900011442A/en
Application grantedgrantedCritical
Publication of KR0144573B1publicationCriticalpatent/KR0144573B1/en