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Application filed by Josef Otevrel, Oldrich Ing KarpisekfiledCriticalJosef Otevrel
Priority to CS204689ApriorityCriticalpatent/CS273909B1/en
Publication of CS204689A1publicationCriticalpatent/CS204689A1/en
Publication of CS273909B1publicationCriticalpatent/CS273909B1/en