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 Friedrich, Rostislav SormafiledCriticalJaroslav Friedrich
Priority to CS863134ApriorityCriticalpatent/CS257969B1/en
Publication of CS313486A1publicationCriticalpatent/CS313486A1/en
Publication of CS257969B1publicationCriticalpatent/CS257969B1/en