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Priority to DD17909274ApriorityCriticalpatent/DD112074A1/xx
Publication of DD112074A1publicationCriticalpatent/DD112074A1/xx
Priority to HU75SI1467Aprioritypatent/HU174638B/hu
Priority to CS402875Aprioritypatent/CS201092B1/cs
Priority to SU752142466Aprioritypatent/SU691129A1/ru