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Application filed by Vaclav Velechovsky, Vojtech HajsmanfiledCriticalVaclav Velechovsky
Priority to CS874814ApriorityCriticalpatent/CS262153B1/en
Publication of CS481487A1publicationCriticalpatent/CS481487A1/en
Publication of CS262153B1publicationCriticalpatent/CS262153B1/en