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 Jiri Srovnal, Antonin Beranek, Vaclav PolakfiledCriticalJiri Srovnal
Priority to CS841941ApriorityCriticalpatent/CS239954B1/en
Publication of CS194184A1publicationCriticalpatent/CS194184A1/en
Publication of CS239954B1publicationCriticalpatent/CS239954B1/en