Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Frantisek Hala, Zdenek BlazekfiledCriticalFrantisek Hala
Priority to CS206977ApriorityCriticalpatent/CS184398B1/en
Publication of CS184398B1publicationCriticalpatent/CS184398B1/en