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 Dvorak Jiri, Karel Pech, Frantisek Sporek, Jaromir DvorakfiledCriticalDvorak Jiri
Priority to CS834286ApriorityCriticalpatent/CS238989B1/en
Publication of CS428683A1publicationCriticalpatent/CS428683A1/en
Publication of CS238989B1publicationCriticalpatent/CS238989B1/en