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 Vaclav Mrstina, Jaroslav Ing KropacekfiledCriticalVaclav Mrstina
Priority to CS831191ApriorityCriticalpatent/CS231141B1/en
Publication of CS119183A1publicationCriticalpatent/CS119183A1/en
Publication of CS231141B1publicationCriticalpatent/CS231141B1/en