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Application filed by Josef Ing Jurman, Vaclav KrygelfiledCriticalJosef Ing Jurman
Priority to CS858588ApriorityCriticalpatent/CS261367B1/en
Publication of CS858885A1publicationCriticalpatent/CS858885A1/en
Publication of CS261367B1publicationCriticalpatent/CS261367B1/en