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
Priority claimed from CS311883Aexternal-prioritypatent/CS234289B1/en
Application filed by Nikolaj Patev, Zdenek LachmannfiledCriticalNikolaj Patev
Priority to CS666986ApriorityCriticalpatent/CS258335B3/en
Publication of CS666986A1publicationCriticalpatent/CS666986A1/en
Publication of CS258335B3publicationCriticalpatent/CS258335B3/en