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 Svec, Ladislav Ing HlavatyfiledCriticalFrantisek Svec
Priority to CS856435ApriorityCriticalpatent/CS256438B1/cs
Publication of CS643585A1publicationCriticalpatent/CS643585A1/cs
Publication of CS256438B1publicationCriticalpatent/CS256438B1/cs