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Application filed by Josef Kovar, Bubenicek Jan, Novotny KarelfiledCriticalJosef Kovar
Priority to CS886694ApriorityCriticalpatent/CS271911B1/en
Publication of CS669488A1publicationCriticalpatent/CS669488A1/en
Publication of CS271911B1publicationCriticalpatent/CS271911B1/en