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Application filed by Ervin Ing Vrabel, Vladimir Ing Cihak, Gorgon Oldrich, Josef ZivanskyfiledCriticalErvin Ing Vrabel
Priority to CS864939ApriorityCriticalpatent/CS270655B1/cs
Publication of CS493986A1publicationCriticalpatent/CS493986A1/cs
Publication of CS270655B1publicationCriticalpatent/CS270655B1/cs