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 Jaroslav Barta, Oldrich TrojanfiledCriticalJaroslav Barta
Priority to CS69975ApriorityCriticalpatent/CS180810B1/en
Publication of CS180810B1publicationCriticalpatent/CS180810B1/en