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 Flok, Karel Sir, Zdenek Hruda, Josef KlimafiledCriticalFrantisek Flok
Priority to CS868578ApriorityCriticalpatent/CS261786B1/en
Publication of CS857886A1publicationCriticalpatent/CS857886A1/en
Publication of CS261786B1publicationCriticalpatent/CS261786B1/en