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Application filed by Ludvik Popelka, Ladislav Ing LzicarfiledCriticalLudvik Popelka
Priority to CS863545ApriorityCriticalpatent/CS255183B1/en
Publication of CS354586A1publicationCriticalpatent/CS354586A1/en
Publication of CS255183B1publicationCriticalpatent/CS255183B1/en