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Application filed by Frantisek Valo, Rudolf Oravec, Jozef Ing PetrovicfiledCriticalFrantisek Valo
Priority to CS831583ApriorityCriticalpatent/CS252354B1/en
Publication of CS158383A1publicationCriticalpatent/CS158383A1/en
Publication of CS252354B1publicationCriticalpatent/CS252354B1/en