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Priority to DD15611671ApriorityCriticalpatent/DD94797A1/xx
Priority to DE19722226121prioritypatent/DE2226121A1/de
Priority to CS432772Aprioritypatent/CS155123B2/cs
Priority to SU1800805Aprioritypatent/SU559657A3/ru
Publication of DD94797A1publicationCriticalpatent/DD94797A1/xx