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 Josef LangrfiledCriticalJosef Langr
Priority to CS893009ApriorityCriticalpatent/CS272049B1/en
Publication of CS300989A1publicationCriticalpatent/CS300989A1/en
Publication of CS272049B1publicationCriticalpatent/CS272049B1/en