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Application filed by Vladimir Ing Dittrich, Petr Ing Csc Janata, Svatopluk FrancfiledCriticalVladimir Ing Dittrich
Priority to CS864929ApriorityCriticalpatent/CS272159B1/en
Publication of CS492986A1publicationCriticalpatent/CS492986A1/en
Publication of CS272159B1publicationCriticalpatent/CS272159B1/en