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 Oldrich Prochazka, Jaroslav Stejskal, Josef Ing Kalivoda, Jaroslav KalinafiledCriticalOldrich Prochazka
Priority to CS828506ApriorityCriticalpatent/CS231117B1/en
Publication of CS850682A1publicationCriticalpatent/CS850682A1/en
Publication of CS231117B1publicationCriticalpatent/CS231117B1/en