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Application filed by Jaroslav Stepanek, Ladislav Prom Fyz HeglasfiledCriticalJaroslav Stepanek
Priority to CS87814ApriorityCriticalpatent/CS272459B1/en
Publication of CS81487A1publicationCriticalpatent/CS81487A1/en
Publication of CS272459B1publicationCriticalpatent/CS272459B1/en