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 Ladislav Ryznar, Zdenek Gatek, Oldrich PurfiledCriticalLadislav Ryznar
Priority to CS386977ApriorityCriticalpatent/CS192250B1/cs
Publication of CS192250B1publicationCriticalpatent/CS192250B1/cs