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Priority to DD16436972ApriorityCriticalpatent/DD108850A1/xx
Priority to HUEE002111prioritypatent/HU167917B/hu
Priority to DE19732320308prioritypatent/DE2320308A1/de
Priority to CS502273Aprioritypatent/CS169040B1/cs
Publication of DD108850A1publicationCriticalpatent/DD108850A1/xx