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Application filed by Jiri Ing Doubravsky, Frantisek Ing DoubravskyfiledCriticalJiri Ing Doubravsky
Priority to CS804286ApriorityCriticalpatent/CS231718B1/en
Publication of CS428680A1publicationCriticalpatent/CS428680A1/en
Publication of CS231718B1publicationCriticalpatent/CS231718B1/en