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Priority claimed from DE19883820678external-prioritypatent/DE3820678A1/en
Priority claimed from DE3913744Aexternal-prioritypatent/DE3913744A1/en
Application filed by Krupp Koppers GmbhfiledCriticalKrupp Koppers Gmbh
Application grantedgrantedCritical
Publication of ATE81302T1publicationCriticalpatent/ATE81302T1/en