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 Josef Ryska, Frantisek Petracek, Karel Pohl, Jan SajasfiledCriticalJosef Ryska
Priority to CS7500002003ApriorityCriticalpatent/CS179120B1/cs
Publication of CS179120B1publicationCriticalpatent/CS179120B1/cs