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Priority to DD15693071ApriorityCriticalpatent/DD97817A3/xx
Priority to DE19722233634prioritypatent/DE2233634A1/de
Priority to CS537072Aprioritypatent/CS161054B2/cs
Priority to FR7228335Aprioritypatent/FR2149931A5/fr
Publication of DD97817A3publicationCriticalpatent/DD97817A3/xx