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Application filed by Ludvik Kralik, Vladislav Ing ZejdafiledCriticalLudvik Kralik
Priority to CS831477ApriorityCriticalpatent/CS232081B1/en
Publication of CS147783A1publicationCriticalpatent/CS147783A1/en
Publication of CS232081B1publicationCriticalpatent/CS232081B1/en