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Application filed by Bohumil Novotny, Palik FrantisekfiledCriticalBohumil Novotny
Priority to CS842391ApriorityCriticalpatent/CS238549B1/cs
Publication of CS239184A1publicationCriticalpatent/CS239184A1/cs
Publication of CS238549B1publicationCriticalpatent/CS238549B1/cs