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 Trefil, Josef Sojka, Petr Ing Kalivoda, Karel Ing SpesnyfiledCriticalFrantisek Trefil
Priority to CS8510098ApriorityCriticalpatent/CS256104B1/en
Publication of CS1009885A1publicationCriticalpatent/CS1009885A1/en
Publication of CS256104B1publicationCriticalpatent/CS256104B1/en