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Application filed by Jan Chlapik, Anton Ondrejovic, Frantisek SutovskyfiledCriticalJan Chlapik
Priority to CS886465ApriorityCriticalpatent/CS267792B1/en
Publication of CS646588A1publicationCriticalpatent/CS646588A1/en
Publication of CS267792B1publicationCriticalpatent/CS267792B1/en